Preface. Part I: Introduction. The Discovery of HTc Superconductivity and its Decisive Circumstances; J.G. Bednorz. Part II: General Problems. `S' and `d' Wave Symmetry Components in High-Temperature Cuprate Superconductors; K.A. Muller, H. Keller. Theory Aspects of High-Temperature Superconductivity; R. Micnas, S. Robaskiewicz. Part III: New Materials and Structures. Novel Two-Dimensional Perovskites; J.G. Bednorz, et al. Mechanisms Generating Layered Cuprates and Oxycarbonates: Classification; B. Raveau. Mercurocuprates: The Highest Transition-Temperature Superconductors; P.P. Edwards, et al. High Pressure Crystal Growth and Properties of HgBa2Can-1CunO2n+2+delta, Sn1-xCuO2, CaCuO2 and Y2Ba4Cu6+nO14+n; J. Karpinski, et al. Noncuprate Layered Perovskite Superconductor; Y. Maeno, S. Ikeda. Non-Toxic HTSC Materials, Substitution in the Charge Reservoir Layer: `Cupro/Carbonate' Cuprates and Related Materials; M.A. Alario-Franco, et al. Part IV: Phase Separation, Electronic Inhomogeneities, and Related Problems. 1. General. The Two-Component Paradigm for Superconductivity in the Cuprates; D. Mihailovic, K.A. Muller. Two- Component High Tc Superconductivity: Charge Reservoirs, Phase Separation and Optical Excitations; D. Mihailovic. 2. The La-Cuprate System. Structural Phase Transitions and Superconductivity in Lanthanum Copper Oxydes; M.K. Crawford, et al. Magnetic Properties of Single-Layer Cuprates; D.C. Johnston, et al. Structural Phase Transitions and Incommensurate Spin Fluctuations in the La2CuO4+y System; B.O.Wells, et al. Phase Separation and Stripe-Like Modulation Observation in Cu-Doped La2CuO4+ System; Z.X. Zhao, et al. 3. The Bi-Cuprate System. From a Homogeneous CuO2 Plane to a Superlattice of Quantum Stripes; A. Bianconi, et al. Lattice Effect and D-Electron Delocalization Effect Around Tc in Bi-Based High-Tc Superconductors; Y. Li, et al. 4. The Y-Cuprate System and Related Compounds. Lattice Instabilities, Structural Anomalies and Phase Transitions in Y1-yCayBa2Cu3Ox Phases; E. Kaldis. Raman Scattering in the YBCO Compounds; E. Liarokapis. Local Structure Studies of the Underdoped-Overdoped Transition in Yba2Cu3Ox. Measurement of the Yttrium X-Ray Absorption-Fine-Structure; J. Roehler, et al. Neutron Spectroscopy of Rare Earths in Superconducting Materials; W. Henggeler, et al. Tm NMR and Cu NQR Studies of Phase Separation in TmBaCuO Compounds; M.A. Teplov, et al. Part V: Applications. Applications of High-Tc Superconductors; H. Rietschel. Index.