Proceedings of the 31st Symposium on Rock Mechanics, held at Golden, Colo., June 1990. The papers cover such areas as experimental studies; conceptual, analytical, and numerical modeling; and design and construction methods.

W. Hustrulid (Edited by) Colorado School of Mines, Golden. G.A. Johnson (Edited by) US Bureau of Mines, Denver.

Preface, Extended abstracts of award winning papers; The Canadian Connection, Coal Mine Stability; Coal Mining; Coal Strata; Discontinuities; Fratcure Mechanics; Hard Core Modelling; Hydro-Geology; In-Situ Testing; Jointed Rock; Mechanical Fragmentation; Metal Mining; Mine Subsidence; New Instruments; New Laboratory Testing Techniques; Oil & Gas; Open Pit Mining; PC Based Modelling of Practical Problems; QA Effects; Reinforcement; Remote Sensing-Borehold Geophysics; Rock Blasting; Rock Bursts;Rock Deformation; The Scaninavian Connection.