Preface. From Integrable Models to Conformal Field Theory via Quantum Groups; L.D. Faddeev. A Brief History of Hidden Quantum Symmetries in Conformal Field Theories; C. Gomez, G. Sierra. q-Deformation of Semisimple and Non-Semisimple Lie Algebras; H. Ruegg. Quantum Algebras and Quantum Groups in q-Special Function Theory; R. Floreanini, L. Vinet. Lectures in Topological Quantum Field Theory; D.S. Freed. Canonical Quantum Gravity and the Problem of Time; C.J. Isham. Higher Symmetries in Lower-Dimensional Models; R. Jackiw. Three Lectures on Supersymmetry and Extended Objects; P.K. Townsend. The Geometric Phase in Quantum Physics; A. Bohm. Quantum Mechanics on Phase Space; M. Gadella. Lie Groups and Solutions of Nonlinear Partial Differential Equations; P. Winternitz. Index.