Contents: The Spinning String (P Di Vecchia); Riemann Surfaces and String Theory (E Gava); The Bosonic String from an Algebra-geometric Standpoint (M Cornalba); Classical and Quantum Theory of Supersymmetric a- Models (S Mukhi); Non-linear a-Models and String Theories (A Sen); Virasoro Gauge Conditions and String Equations of Motion (S R Wadia); Antisymmetric Tensor Fields in String Theory (R Rohm); Toroidal Compactification of Heterotic String (K S Narain); (p, 0) Supergravity and H terotic Superstrings (M Evansand B A Ovrut); Topics in Superstring Theory (P H Frampton); Field Theory of Strings (K Kikkawa); Introduction to Covariant Formulation of Superstring (Field) Theory (S Uehara); Towards a Superstring Cosmology (J G Taylor); The Interacting Field Theories of Strings and Superstrings (M A Awada); Manifold Compactification of Superstrings (T Hiibsch); New Issues in Supergravity Theories (L Girardel/o); Some Questions Concerning the Low-energy Limit of Superstring Theories (H P Nilles); Superstrings and Preons: New Dynamics and a New Approach to Unification (J C Pati); Neutrino Mass, Flavor and Mixing in Cosmology (R Cowsik); Dynamics of Galaxies Embedded in Dark Matter (R Cowsik); Physics of the Early Universe: The Inflationary Universe and Cosmic Strings (R H Brandenberger); Dynamically Generated Fermionic Masses (M Cvetic);