CONTENTS: Weak Coupling Theory of High Temperature Superconductors; Investigations of a Few Novel Series of Thallium Cuprate Superconductors Showing Possible Change in the Sign of Charge Carriers with Composition; Some Structural & Chemical Aspects of the Bi-Pb-Sr-Ca-Cu-O System; High Magnetic Field Studies of High Temperature Superconductors; Fabrication of Bi-Sr-Ca-Cu Oxide Superconductors with Controlled Numbers of Cu-0 Layers; Characterization of High Temperature Superconductors by High Excitation Spectroscopies; Mossbauer Spectroscopy of High Temperature Superconductors; RVB & Related Theories of HTSC; Fabrication of 107k Superconducting Films & Their Normal State Transport Properties; Ion Beam Analysis of High T Superconductors; Thermal Conductivity of High Temperature Superconductor; A New Theoretical Approach to Electron Pairing And Uperconductivity in High T Superconductors; High Resolution Polarized X-Ray Absorption Spectroscopy: Symmetry of the Hole States in High-T Superconductors; Phase Diagrams in the Y-Ba-Cu-O System & Crystal Growth of Ybco Superconductors; Index.