Acoustic emissions in geotechnical engineering practice a symposium sponsored by ASTM Committee D-18 on Soil and Rock for Engineering Purposes, American Society for Testing and Materials, Detroit, Mich., 24 June 1981, V. P. Drnevich, University of Kentucky, R. E. Gray, GAI Consultants, Inc., editors. - Drnevich, Vincent P.; Gray, R. E. (Journal of ASTM International., 1981)