AMS Sectional Meeting Program by Day
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Inquiries: meet@ams.org
1997 Spring Western Sectional Meeting
Corvallis, OR, April 1920, 1997
Meeting #921
Associate secretaries: William A Harris, Jr, AMS wharris@math.usc.edu
Saturday April 19, 1997

Saturday April 19, 1997, 7:30 a.m.5:00 p.m.
Registration
Room 108, Kidder Hall, Mathematics Learning Center

Saturday April 19, 1997, 7:30 a.m.5:00 p.m.
Exhibit and Book Sale
Room 108, Kidder Hall, Mathematics Learning Center

Saturday April 19, 1997, 8:00 a.m.10:50 a.m.
Special Session on Geometric Mechanics, I
Room 106, Strand Agricultural Hall Organizers: Judith M. Arms, University of Washington arms@math.washington.edu
John V. Leahy, University of Oregon leahy@math.uoregon.edu

8:00 a.m.
Minimal Legendrian Tangles
Lisa M. Traynor*, Bryn Mawr College
(9215388)

8:25 a.m.
Moduli Spaces of stable Polygons and Symplectic Structures on $\overline{\cal M}_{0,n}$
Yi Hu*, University of California, Berkeley
(92157144)

8:50 a.m.
Cohomology of Jacobi Algebras
Ann M. Ritchey*, University of Oregon
(92158161)

9:15 a.m.
Equivariant moment maps for Poisson Lie groups
Viktor L. Ginzburg*, University of California, Santa Cruz
(92158115)

9:40 a.m.
Spectral geometry of Hopf fibrations
Peter B. Gilkey, University of Oregon
John V. Leahy*, University of Oregon
JeongHyeong Park,
(92158156)

10:05 a.m.
Integrable convex billiard tables and conjugate points
Edoh Y. Amiran*, Western Washington University
(9215847)

10:30 a.m.
Stacked Lagrange tops and multicomponent systems
Debra K Lewis*, University of California at Santa Cruz
(92170120)

Saturday April 19, 1997, 8:00 a.m.10:50 a.m.
Special Session on Geometric Methods in Mathematical Physics, I
Room 109, Strand Agricultural Hall Organizers: Juha Pohjanpelto, Oregon State University juha@math.orst.edu

8:00 a.m.
Some Global Properties of Vacuum Spacetimes with $U(1)xU(1)$Isometry
James A. Isenberg*, University of Oregon
(92183171)

8:25 a.m.
Differential Invariants and Moving Frames
Mark E. Fels*, University of Minnesota
Peter J. Olver, University of Minnesota
(9215886)

8:50 a.m.
Conservation laws of hyperbolic MongeAmpere systems
Lucas Hsu*, University of Arizona
(92153137)

9:15 a.m.
Characteristic Lagrangians and Local Obstructions to GlobalExistence Problems in Differential Geometry
Ian M. Anderson*, Utah State University
Mark E. Fels, University of Minnesota
(92158112)

9:40 a.m.
Direct construction of conservation laws from field equations
Stephen C Anco, University of British Columbia
George W Bluman*, University of British Columbia
(9213573)

10:05 a.m.
The multidimensional Darboux transformation.
Niky Kamran*, McGill University
(92158162)

10:30 a.m.
Symmetries, conservation laws, and variational principles forvector field theories
Ian M. Anderson, Utah State University
Juha Pohjanpelto*, Oregon State University
(92158104)

Saturday April 19, 1997, 8:30 a.m.10:45 a.m.
Special Session on Actuarial and Financial Mathematics, I
Room 100, Social Science Building Organizers: Donald Jones, Oregon State University donjones@math.orst.edu
Enrique A. Thomann, Oregon State University thomann@math.orst.edu
Edward C. Waymire, Oregon State University waymire@math.orst.edu

8:30 a.m.
QuasiMonte Carlo Computations in Finance
Russel E. Caflisch*, UCLA
(9219036)

9:05 a.m.
SemiAnalytic Approximation of Asian Options and Options on a Stock with Constant Continuous Dividend Payout.
Yuri Y Boykov*, Carnegie Mellon University
(92190151)

9:40 a.m.
Catastrophe Risk Bonds
Hal Warren Pedersen*, Georgia State University
(92190159)

10:15 a.m.
Applications of Actuarial Risk Theory in the Investment World
Tony Zeppetella*, Phoenix Home Life Mutual Insurance Company
(92190175)

Saturday April 19, 1997, 8:30 a.m.10:30 a.m.
Special Session on Algebraic and Elementary Number Theory, I
Room 115, Social Science Building Organizers: Richard A. Mollin, University of Calgary ramollin@math.ucalgary.ca
Peter J. Shiue, University of Nevada, Las Vegas shiue@nevada.edu

8:30 a.m.
Prime densities for linear recurrences
Peter Stevenhagen*, Universiteit van Amsterdam, The Netherlands
(9211112)

8:55 a.m.
Bounds for Frequencies of Residues in SecondOrder Recurrences Modul $p^r$
Lawrence E. Somer*, Catholic University of America
(9211138)

9:20 a.m.
Pseudoprimes, Perfect Numbers, and a Problem of Lehmer
Walter Carlip,
Eliot T Jacobson*,
Lawrence Somer,
(92111127)

9:45 a.m.
Stability of TwoTerm Recurrence Sequences
Walter Carlip*, Ohio University
Eliot Jacobson, Ohio University
(92111128)

10:10 a.m.
Some Remarks on the Distribution of Second Order Linear Recurrences
John R. Burke*, Gonzaga University
(92111102)

Saturday April 19, 1997, 8:50 a.m.10:45 a.m.
Special Session on Octonions and Clifford Algebras, I
Room 132, Strand Agricultural Hall Organizers: Tevian Dray, Oregon State University tevian@math.orst.edu
Corinne Manogue, Oregon State University corinne@physics.orst.edu

8:50 a.m.
Matrix Exponential via Clifford Algebras
Rafa\l F. Ab\l amowicz*, Gannon University
(9211692)

9:20 a.m.
Octonions and Clifford Algebras
Susumu Okubo*, University of Rochester
(9211730)

9:50 a.m.
Dirac Operators, Conformal Transformations and Classical HarmonicAnalysis
John Ryan*, University of Arkansas
(9213037)

10:20 a.m.
Octonionic M\"obius Transformations
Corinne A. Manogue*, Oregon State University
Tevian Dray, Oregon State University
(9211781)

Saturday April 19, 1997, 9:00 a.m.10:50 a.m.
Special Session on Combinatorial Methods in Molecular Biology, I
Room 104, Social Science Building Organizers: Pavel Pevzner, University of Southern California ppevzner@hto.usc.edu
Michael S. Waterman, University of Southern California msw@hto.usc.edu

9:00 a.m.
Reading DNA Sequences
Michael S. Waterman*, University of Southern California
(9219274)

9:40 a.m.
Compound Poisson and Poisson process approximations for occurrences of multiple words, and application to certain stemloop motifs
Gesine D. Reinert*, UCLA
Sophie Schbath,
(9216083)

10:20 a.m.
DNA Computing and the Combinatorics of Polynomial Systems
J. Maurice Rojas*, Massachusetts Institute of Technology
(92168165)

Saturday April 19, 1997, 9:00 a.m.10:50 a.m.
Special Session on Geometric Analysis, I
Room 222, Strand Agricultural Hall Organizers: Harold R. Parks, Oregon State University parks@math.orst.edu
Donald C. Solmon, Oregon State University solmon@math.orst.edu

9:00 a.m.
Boundary behavior of solutions of some elliptic boundary value problems near nonconvex corners
Zhiren Jin, Wichita State University
Kirk E. Lancaster*, Wichita State University
(9213587)

9:40 a.m.
Volume Comparison and Nonnegative Ricci Curvature Outside a Compact Set
Zhongdong Liu*, University of South Carolina
(9215311)

10:20 a.m.
Regularity of level surfaces of Green's function in exterior sphere domains
Stephen J. Fromm*,
David Jerison,
(9213521)

Saturday April 19, 1997, 9:00 a.m.10:50 a.m.
Special Session on Mathematical Issues in Physical Oceanography, I
Room 108, Social Science Building Organizers: Robert L. Higdon, Oregon State University higdon@math.orst.edu

9:00 a.m.
Hamilton's Principle Asymptotics andWeak Solutions in Geophysical Fluid Dynamics
Darryl D. Holm*, Theoretical Division and Center for Nonlinear Studies, LANL, New Mexico
(9213523)

9:30 a.m.
Wave permeable boundary conditions for the simulationof continuously stratified flows
Dale R Durran*, Department of Atmospheric Sciences, University of Washington
(9216563)

10:00 a.m.
Low Froude Number Dynamics for Stably Stratified Rotating Flowswith Fixed or Small Rossby Numbers
Pedro F Embid*, The University of New Mexico
(92186116)

10:30 a.m.
Modeling a solid boundary as a fluid of infinite viscosity
Harry Gingold*, West Virginia University
Dinesh Gera, West Virginia University
(9217629)

Saturday April 19, 1997, 9:00 a.m.10:50 a.m.
Special Session on Operator Algebras, I
Room 111, Strand Agricultural Hall Organizers: Huaxin Lin, University of Oregon hlin@bright.uoregon.edu
Christopher Phillips, University of Oregon phillips@bright.uoregon.edu

9:00 a.m.
Applications of Voiculescu's Free Entropy
Liming Ge*, Massachusetts Institute of Technology
(9214622)

9:30 a.m.
An application of the free entropy: the primality of subfactors of finite index in the interpolated free group factors
Marius B Stefan*, The University of Iowa
(9214745)

10:00 a.m.
Unbounded Fredholm modules and spectral flow
John Phillips*, University of Victoria
Alan Carey, University of Adelaide, SA, Australia
(92119145)

10:30 a.m.
2Hilbert spaces and representation theory
John C. Baez*, University of California, Riverside
(9214350)

Saturday April 19, 1997, 9:00 a.m.10:50 a.m.
Special Session on Singular Perturbations, Theory and Applications, I
Room 211, Strand Agricultural Hall Organizers: Leonid Viktorovich Kalachev, University of Montana leonid@selway.umt.edu
Robert E. O'Malley, Jr., University of Washington omalley@amath.washington

9:00 a.m.
The Midpoint Scheme and Variants for Hamiltonian Systems: Advantages and Pitfalls
Uri M. Ascher*, University of British Columbia
Sebastian Reich, KonradZuseZentrum, Germany
(92165100)

9:30 a.m.
The Sequential Regularization Method and Its Applications
Ping Lin*, Stanford University
(9216552)

10:00 a.m.
Deterministic Chaos and Analysis of Singularities
Alexander Tovbis*, University of Central Florida
(9213459)

10:30 a.m.
Perturbation Analysis of a Nonautonomous and Nonlinear Spurious Solutions Problem
A. D. MacGillivray*, SUNY at Buffao
(9214160)

Saturday April 19, 1997, 9:15 a.m.10:40 a.m.
Special Session on Inverse Problems, I
Room 226, Strand Agricultural Hall Organizers: Adel Faridani, Oregon State University faridani@math.orst.edu
David V. Finch, Oregon State University finch@math.orst.edu

9:15 a.m.
Inverse problems for the transport equation
Mourad Choulli, Universit\'e de FrancheComt\'e
Plamen Stefanov*,
(9213570)

9:45 a.m.
Inverse Obstacle Scattering: reconstructions from the least possibledata.
Rainer Kre\ss, Institut f\"ur Numerische und Angewandte Mathematik,
William Rundell*, Texas A&M University
(92135105)

10:15 a.m.
Carleman Estimates in Inverse and IllPosed Problems
Aleksandr L$'$vovich Bukhge\u\i m*, Sobolev Institute of Mathematics, Siberian Division of the RAS
(92135119)

Saturday April 19, 1997, 11:00 a.m.11:50 a.m.
Invited Address
Transforming Men into Mice.
Gilfillan Auditorium, Wilkinson Hall
Pavel A. Pevzner*, University of Southern California
(92105136)

Saturday April 19, 1997, 2:00 p.m.2:50 p.m.
Invited Address
Stabilization and dynamics of balance systems
Gilfillan Auditorium, Wilkinson Hall
Jerrold E. Marsden*, California Institute of Technology
(9210006)

Saturday April 19, 1997, 3:00 p.m.5:15 p.m.
Special Session on Actuarial and Financial Mathematics, II
Room 100, Social Science Building Organizers: Donald Jones, Oregon State University donjones@math.orst.edu
Enrique A. Thomann, Oregon State University thomann@math.orst.edu
Edward C. Waymire, Oregon State University waymire@math.orst.edu

3:00 p.m.
Generation and Simulation of Interest Rate Term Structures
William J. Morokoff*, UCLA and C.ATS Software
(9216597)

3:35 p.m.
Volatility Modeling and Estimation of Highfrequency Data withGaussian Noise
Yue Fang*, University of Oregon
(9216299)

4:10 p.m.
Pricing perpetual American options with the geometric shifted Poisson process
Frederic Michaud*, Universite Laval
(9219971)

4:45 p.m.
Calibration of Interest Rate Models
Eduard Harabetian*, University of Michigan
(92190163)

Saturday April 19, 1997, 3:00 p.m.6:15 p.m.
Special Session on Algebraic and Elementary Number Theory, II
Room 115, Social Science Building Organizers: Richard A. Mollin, University of Calgary ramollin@math.ucalgary.ca
Peter J. Shiue, University of Nevada, Las Vegas shiue@nevada.edu

3:00 p.m.
Diophantine Equations and Ideals
Richard A. Mollin*,
(92111142)

3:25 p.m.
Ramanujan's Class Invariants
Bruce C. Berndt*, University of Illinois at UrbanaChampaign
(92111150)

3:50 p.m.
Some curves almost possessing rational points
Andrew Bremner*, Arizona State University
(92111143)

4:15 p.m.
Evaluations of multidimensional Euler/Zagier sums: A compendium of results for arbitrary depths
Jonathan M. Borwein*, CECM, Simon Fraser University
(92111125)

4:40 p.m.
Some conjectures about base 2 pseudoprimes
John Brillhart*, University of Arizona
(9211139)

5:05 p.m.
Composition of forms, ideals and continued fractions
Alfred J. van der Poorten*, Macquarie University, Australia
(9211114)

5:30 p.m.
Explicit Primality Criteria for $(p1)p^n1$
Hugh C. Williams*, University of Manitoba
(9211148)

5:55 p.m.
Imaginary Octic Fields of type (2,2,2) with small class number
Charles John Parry*, Virginia Polytechnic Institute and State University
(92111180)

Saturday April 19, 1997, 3:00 p.m.5:25 p.m.
Special Session on Octonions and Clifford Algebras, II
Room 132, Strand Agricultural Hall Organizers: Tevian Dray, Oregon State University tevian@math.orst.edu
Corinne Manogue, Oregon State University corinne@physics.orst.edu

3:00 p.m.
Octonion X,YProduct: Groups and Clifford Algebras
Geoffrey Dixon*,
(9211716)

3:30 p.m.
The Octonionic Eigenvalue Problem
Tevian Dray*, Dept of Mathematics, Oregon State University
Corinne A. Manogue, Dept of Physics, Oregon State University
(9211780)

4:00 p.m.
Should Absolute Metric Signature Matter in Multivector Theories?
William M. Pezzaglia, Jr.*, Santa Clara University
(92158130)

4:30 p.m.
On the symmetry principle in quaternionic analysis and applications
Vladislav V. Kravchenko, Instituto Politécnico Nacional, Mexico City, MEXICO
Michael V. Shapiro*, Instituto Politécnico Nacional, Mexico City, MEXICO
(9213024)

5:00 p.m.
The Fundamental Theorem of Geometric Calculus via the Generalized Riemann Integral
Alan L Macdonald*, Luther College
(9212853)

Saturday April 19, 1997, 3:00 p.m.4:50 p.m.
Special Session on Combinatorial Methods in Molecular Biology, II
Room 104, Social Science Building Organizers: Pavel Pevzner, University of Southern California ppevzner@hto.usc.edu
Michael S. Waterman, University of Southern California msw@hto.usc.edu

3:00 p.m.
Local Rules for Protein Folding on a Triangular Lattice and Generalized Hydrophobicity in the HP Model
Richa Agarwala, National Institutes of Health
Serafim Batzoglou, Massachusetts Institute of Technology
Vlado Dan{\v c}{\'\i}k*, University of Southern California
Scott E. Decatur, Massachusetts Institute of Technology
Martin Farach, Rutgers University
Sridhar Hannenhalli, University of Southern California
S. Muthukrishnan, Bell Laboratories
Steven Skiena, SUNY Stony Brook
(9216865)

3:40 p.m.
Evolutionbased Sequence Matching
Paul Cull*, Oregon State University
James L. Holloway,
Jeffrey D. Cavener,
(92199107)

4:20 p.m.
A new method for a biological changepoint problem: Dynamic programming detection of chimeric 16S rRNA artifacts
George A Komatsoulis*, University of Southern California
Michael S Waterman, University of Southern California
(92192135)

Saturday April 19, 1997, 3:00 p.m.5:30 p.m.
Special Session on Geometric Analysis, II
Room 222, Strand Agricultural Hall Organizers: Harold R. Parks, Oregon State University parks@math.orst.edu
Donald C. Solmon, Oregon State University solmon@math.orst.edu

3:00 p.m.
Secondary Characteristic Currents
John W Zweck*, University of Nevada, Reno NV 89557
(9215841)

3:40 p.m.
The solution of the Equichordal Point Problem
Marek R Rychlik*, University of Arizona
(92139138)

4:20 p.m.
Another unexpected appearance of the cycloid
Michael G Kerckhove, University of Richmond
Gary R Lawlor*, Brigham Young University
(9214984)

5:00 p.m.
Areaminimizing hypersurfaces with prescribed asymptotics at infinity
Claire C Chan*, University of Utah
(92100118)

Saturday April 19, 1997, 3:00 p.m.5:50 p.m.
Special Session on Geometric Mechanics, II
Room 106, Strand Agricultural Hall Organizers: Judith M. Arms, University of Washington arms@math.washington.edu
John V. Leahy, University of Oregon leahy@math.uoregon.edu

3:00 p.m.
A Lie algebraic generalization of the Mumford system, its symmetries and its multiHamiltonian structure
Pol Vanhaecke*, University of California, Davis
Marco Pedroni, Universita di Genova, Italy
(92158121)

3:25 p.m.
On Quantizing $T^*\!S^1$
Mark J. Gotay*, University of Hawai`i
(9218162)

3:50 p.m.
Spin$^c$ quantization
Ana Canas da Silva*, University of California, Berkeley and Instituto Superior Tecnico, Portugal
Yael Karshon, The Hebrew University of Jerusalem, Israel
Susan Tolman, Princeton University
(92153106)

4:15 p.m.
Some new results in the reduction of Hamiltonian systems withsymmetry.
JuanPablo Ortega*, University of CaliforniaSanta Cruz
(9217056)

4:40 p.m.
On the stability of relative equilibria
Eugene M Lerman*, University of Illinois at UrbanaChampaign
(9215833)

5:05 p.m.
Symmetry Reduction of Variational Bicomplexes and the Principleof Symmetric Criticality.
Ian M. Anderson*, Utah State University
Mark E. Fels, University of Minnesota
(92158111)

5:30 p.m.
The mechanical connection and the complexified group action
Judith M. Arms*, University of Washington
(92170149)

Saturday April 19, 1997, 3:00 p.m.5:20 p.m.
Special Session on Mathematical Issues in Physical Oceanography, II
Room 108, Social Science Building Organizers: Robert L. Higdon, Oregon State University higdon@math.orst.edu

3:00 p.m.
Justification of shallow water approximations to rigid lidflows with bottom topography.
Marcel Oliver*, University of California, Irvine
(92135134)

3:30 p.m.
Exploring the Potential Power of SincGalerkin Techniques in the Numerical Solution of Physical Oceanography Problems
Donald F Winter*, University of Redlands
Kenneth L. Bowers, Montana State University
John Lund, Montana State University
(92165148)

4:00 p.m.
Equations of Motion for LargeScale Modelling
Geoffrey K Vallis, Esq.*, UCSC
(92176152)

4:30 p.m.
On symmetric instabilities in ocean bottom boundary layers
John S. Allen*, College of Oceanic & Atmospheric Sciences., Oregon State University
(92176169)

5:00 p.m.
Globally WellPosed ShallowWater Equations
C. David Levermore*, University of Arizona
(92176170)

Saturday April 19, 1997, 3:00 p.m.5:50 p.m.
Special Session on Operator Algebras, II
Room 111, Strand Agricultural Hall Organizers: Huaxin Lin, University of Oregon hlin@bright.uoregon.edu
Christopher Phillips, University of Oregon phillips@bright.uoregon.edu

3:00 p.m.
Characteristic Square of a Factor and Cocycle Conjugacy of Group Actions
Masamichi Takesaki*, UCLA
(92146160)

3:30 p.m.
New results in the theory of quantum dynamical semigroups
William Arveson*, University of California, Berkeley
(92146176)

4:00 p.m.
Generalized solenoids and C*algebras
Valentin Deaconu*, University of Nevada, Reno
(92146179)

4:30 p.m.
Toeplitz algebras associated with endomorphims
Mahmood Khoshkam*, University of Saskatchewan
(9214628)

5:00 p.m.
Asymptotic Range for cocycles of groupoid C*algebras
Belisario A. Ventura*, California State University, San Bernardino
(92146178)

5:30 p.m.
Discussion

Saturday April 19, 1997, 3:00 p.m.4:50 p.m.
Special Session on Singular Perturbations, Theory and Applications, II
Room 211, Strand Agricultural Hall Organizers: Leonid Viktorovich Kalachev, University of Montana leonid@selway.umt.edu
Robert E. O'Malley, Jr., University of Washington omalley@amath.washington

3:00 p.m.
Singular Perturbation Analysis of the Solitary Pulse Solution for a Model of Spreading Cortical Depression
Hideo Ikeda, Toyama University, Japan
Robert M. Miura*, University of British Columbia
(9213568)

3:30 p.m.
Metastability for a Generalized Burgers Equation with Applications to Propagating FlameFronts
Xiaodi Sun, University of British Columbia
Michael J. Ward*, University of British Columbia
(9213569)

4:00 p.m.
Asymptotic Analysis of Spiketype Solutions
Leonid V. Kalachev*, University of Montana
(9214151)

4:30 p.m.
Internal layer structure of some parabolic problems
ShagiDi Shih*, University of Wyoming
(9213520)

Saturday April 19, 1997, 3:00 p.m.5:55 p.m.
Special Session on Inverse Problems, II
Room 226, Strand Agricultural Hall Organizers: Adel Faridani, Oregon State University faridani@math.orst.edu
David V. Finch, Oregon State University finch@math.orst.edu

3:00 p.m.
An inverse problem in an infectionagedependentmodel for the dynamics of HIV/AIDS: a preliminary result
Changmei Liu*, Cornell University
Carlos CastilloChavez, Cornell University
(9213582)

3:30 p.m.
Recoverying spatiallyvarying Lam\'e parameters from a tractionexperiment
Steven J. Cox, Rice University
Mark S. Gockenbach*, University of Michigan
(9213590)

4:00 p.m.
Multisensor deconvolution and sampling
David F Walnut*, George Mason University
(92142113)

4:30 p.m.
Phase Space Tomography in Quantum Mechanics
M. G. Raymer*, Department of Physics, University of Oregon, Eugene, OR 97403
(9213576)

5:00 p.m.
Inversion methods for obtaining seabottom geoacoustic parametersfrom partial spectral data
Shixiao Wang*, Department of Mathematical Sciences, Rensselaer Polytechnic Institute
Joyce R. McLaughlin, Department of Mathematical Sciences, Rensselaer Polytechnic Institute
(92135146)

5:30 p.m.
The reconstruction of a first order differential operator fromspectral data.
Steven J. Cox, Rice University
Roger A. Knobel*, University of Texas  Pan American
(9213575)

Saturday April 19, 1997, 4:15 p.m.6:15 p.m.
Special Session on Geometric Methods in Mathematical Physics, II
Room 109, Strand Agricultural Hall Organizers: Juha Pohjanpelto, Oregon State University juha@math.orst.edu

4:15 p.m.
Continuum Solitons and Matrix Integrals
Motohico Mulase*, University of California, Davis
(92158124)

4:40 p.m.
Particle motion in classical field theories
David M Stuart*, IHES, Le Bois Marie, France
(92135168)

5:05 p.m.
Oscillatory phenomena and complex dimensions of fractal strings, with applications to the critical zeros of the Riemann zetafunction
Michel L. Lapidus*, University of California, Riverside
(92158172)

5:30 p.m.
Asymptotic conservation laws in classical field theory
Charles Torre*, Utah State University.
(92183174)

5:55 p.m.
Degenerate solutions of general relativity from 2dimensional topological field theory
John C. Baez*, University of California, Riverside
(9218349)
Inquiries: meet@ams.org

