Introductory Remarks (J.W. Kennedy, L.V. Quintas). Alternating 6-Cycles in Perfect Matchings of Graphs Representing Condensed Benzenoid Hydrocarbons (A.T. Balaban, I. Tomescu). Determining Structural Similarity of Chemicals using Graph-Theoretic Indices (S.C. Basak, V.R. Magnuson, G.J. Niemi, R.R. Regal). Graph Embedding in SYNCHEM2, an Expert System for Organic Synthesis Discovery (J.D. Benstock, D.J. Berndt, K.K. Agarwal). Branching in Graphs and Molecules (S.H. Bertz). Low Density Series Expansions for Backbone Properties of Percolation Clusters (F.M. Bhatti, J.W. Essam). Threshold Phenomena in Random Structures (J.E. Cohen). Shortest-Path Problems and Molecular Conformation (A.W.M. Dress, T.F. Havel). Binomial-Combinatorial Properties of Clar Structures (S. El-Basil). Symmetries of Knotted Hypothetical Molecular Graphs (E. Flapan). Some Applications of Graph Theory to the Study of Polymer Configuration (H. Galina, M.M. Syslo). Antigenesis: A Cascade-Theoretical Analysis of the Size Distributions of Antigen-Antibody Complexes (R. Gross, J.W. Kennedy, L.V. Quintas, M.L. Yarmush). Spectral Properties of Some Structurally Related Graphs (I. Gutman, A. Graovac, O.E. Polansky). Embedding and Characterization of Quantum Chemical Reaction Graphs on Two-Dimensional Orientable Surfaces (F. Harary, P.G. Mezey). The Principle of Valency Conservation, 1. The Skeleton Influence on Pericyclic Reactions (E.C. Hass, P.J. Plath). On Some Counting Polynomials in Chemistry (H. Hosoya). Combinatorial Characterization of Hexagonal Systems (A.D. Jovanovic). Random Hypergraphs and Topological Gelation Criterion for Crosslinked Polymer Systems (W. Klonowski). Redfield's Papers and Their Relevance to Counting Isomers and Isomerizations (E.K. Lloyd). Space-Time `Bonds', Electromagnetism and Graphs (L. Peusner). The Challenge of Characterizing Branching in Molecular Species (D.H. Rouvray). Interacting Dimers on a Sierpinski Gasket (W.A. Seitz, D.J. Klein, G.E. Hite). Chemical Graphs Enumeration and Chemical Reactivity: Thermodynamic and Kinetic Considerations (Z. Slanina). New Results on the Enumeration of Non-Intersecting Random Walks (H.N.V. Temperley). Positive Feedback Loops and Multistationarity (R. Thomas, J. Richelle). Graphical Representation of Regular Resonance Structures and Their Linear Dependence (T.P. Zivkovic). Author Index.
