Contents: -- An introductory survey / S.W. Hawking and W. Israel -- The confrontation between gravitation theory and experiment / C.M. Will -- Gravitational-radiation experiments / D.H. Douglass and V.B. Braginsky -- The initial value problem and the dynamical formulation of general relativity / A.E. Fischer and J.E. Marsden -- Global structure of spacetimes / R. Geroch and G.T. Horowitz -- The general theory of the mechanical, electromagnetic and thermodynamic properties of black holes / B. Carter -- An introduction to the theory of the Kerr metric and its perturbations / S. Chandrasekhar -- Black hole astrophysics / R.D. Blandford and K.S. Thorne -- The big bang cosmology--enigmas and nostrums / R.H. Dicke and P.J.E. Peebles -- Cosmology and the early universe / Ya B. Zelʹdovich -- Anisotropic and inhomogeneous relativistic cosmologies / M.A.H. MacCallum -- Singularities and time-assymetry / R. Penrose -- Quantum field theory in curved spacetime / G.W. Gibbons -- Quantum gravity : the new synthesis / B.S. DeWitt -- The path-integral approach to quantum gravity / S.W. Hawking -- Ultraviolet divergences in quantum theories of gravitation / S. Weinberg.