Intro -- Table of Contents -- Preface -- 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 -- IA-Automorphisms of Free Products of Abelian Groups -- On Artin Groups and Coxeter Groups of Large Type -- The Finite Generation of Aut(G), G-Free Metabelian of Rank ≥ 4 -- Two-Generation Groups III -- The Subgroup Separability of Free Products of Two Free Groups with Cyclic Amalgamation -- Another Proof of the Grushko-Neumann-Wagner Theorem for Free Products -- On Varietal Analogs of higman's Embedding Theorem -- On the Whitehead Method in Free Products -- Quadratic Parametric Equation Over Free Groups -- Finite Groups of Outer Automorphimsms of a Free Group -- A Remark on Automorphism Groups -- On Three of Lyndon's Result About Maps -- On the Indecomposability of Certain Relation Cores -- Fox Subgroups of Free Groups II -- Extension of Groups by Tree Automorphisms -- Length Functions and Algorthims in Free Groups -- Split extensions of Abelian Groups with Identical Subgroup Structures -- Non-Planarity of Planar groups with Reflections -- A Survey of the Conjugacy Problem -- Maximal Algerbars of Binary Relations -- Über Untergruppen Ebener Diskontinuierlicher Gruppen -- Automorphisms of A Free Product with an Amalgamated Subgroup -- Some Remarks on Braid Groups -- Geometric Realization of Goup Extensions by the Seifert Construction -- The Augmentation Quotients of the Groups of Order 24 -- Finite-Dimensional Algebras and K-Groups of Finite Rank -- The Cohomology Ring of a One-Relator Group -- Combinatoria Group Theory, Riemann Surfaces and Differential Equations.