Papers published in honor of Roger Lyndon on his sixtyfifth birthday.

Includes bibliographies.

Roger C. Lyndon: a biographical and personal note ; Spectral complications in cohomology computations ; Lyndon's contribution to cohomology of groups ; Lyndon's research in mathematical logic ; Some aspects of Lyndon's work on group theory ; IAautomorphisms of free products of abelian groups ; On Artin groups and Coxeter groups of large type ; The finite generation of rm Aut(G),\ G free metabelian of rank geq 4 ; Twogenerator groups. III ; The subgroup separability of free products of two free groups with cyclic amalgamation ; Another proof of the GrushkoNeumannWagner theorem for free products ; On varietal analogs of Higman's embedding theorem ; On the Whitehead method in free products ; Quadratic parametric equations over free groups ; Finite groups of outer automorphisms of a free group ; A remark on automorphism groups ; On three of Lyndon's results about maps ; On the indecomposability of certain relation cores ; Fox subgroups of free groups. II ; Extension of groups by tree automorphisms ; Length functions and algorithms in free groups ; Split extensions of abelian groups with identical subgroup structures ; Nonplanarity of planar groups with reflections ; A survey of the conjugacy problem ; Maximal algebras of binary relations ; Uber Untergruppen ebener diskontinuierlicher Gruppen ; Automorphisms of a free product with an amalgamated subgroup ; Some remarks on braid groups ; Geometric realization of group extensions by the Seifert construction ; The augmentation quotients of the groups of order ^4 ; Finitedimensional algebras and roups of finite rank ; The cohomology ring of a onerelator group ; Combinatorial group theory, Riemann surfaces and differential equations Kenneth I Appel ; Saunders Mac Lane ; John G Ratcliffe ; H Jerome Keisler ; Paul E Schupp ; S Andreadakis ; Kenneth I Appel ; Seymour Bachmuth and Horace Y Mochizuki ; J L Brenner R M Guralnick and James Wiegold ; A M Brunner R G Burns and D Solitar ; R G Burns and T C Chau ; Frank B Cannonito ; Donald J Collins and Heiner Zieschang ; Leo P Comerford Jr and Charles C Edmunds ; Marc Culler ; Joan L Dyer ; Leonard Greendlinger and Martin Greendlinger ; K W Gruenberg ; Narain Gupta ; Narain Gupta and Said Sidki ; A H M Hoare ; Charles Holmes ; Johannes Huebschmann ; R Daniel Hurwitz ; Bjarni Jonsson ; R N Kalia and G Rosenberger ; Abe Karrass Alfred Pietrowski and Donald Solitar ; Abe Karrass Alfred Pietrowski and Donald Solitar ; Kyung Bai Lee and Frank Raymond ; Gerald Losey and Nora Losey ; A G Myasnikov and V N Remeslennikov ; John G Ratcliffe ; C L Tretkoff and M D Tretkoff