A Review of Duality, String Vertices, Overlap Identities and the Group Theoretic Approach to String Theories.- The Geometry of the Virasoro Group for Physicists.- Two-Dimensional Supergravities, Hidden Symmetries and Integrable Systems.- Phenomenology of Superstrings and Searches for Supersymmetric Dark Matter.- Effective Nonrenormalizable Theories at One Loop.- Phenomenology of the Higgs Bosons, Z’ and Supersymmetric Particles of the Simplest E6 Inspired Gauge Theory.- Spacetime Couplings and Affine Algebras.- Three Lectures on Flavour Mixing.- Lattice Quantum Chromo dynamics.- Non-Accelerator Particle Physics.- e+ e- Interactions at High Energies.- The Status of Neutral Currents.- pp Collider Physics, Present and Prospects.- Proton-Antiproton Physics: Experimental Aspects.- The Status of the Tevatron.- String Theory at Very High Energies.