sponsored by ASTM Committee D-18 on Soil and Rock for Engineering Purposes, American Society for Testing and Materials, Denver, Colo., 28 June 1977 ; M. L. Silver, Drew Tiedemann, symposium cochairmen
sponsored by ASTM Committee D-18 on Soil and Rock for Engineering Purposes and Committee E-24 on Fracture Testing, American Society for Testing and Materials, Chicago, Ill., 23-24 June 1980