sponsored by the Geo-Institute of the American Society of Civil Engineers in conjunction with the ASCE Convention in Washington, D.C., November 10-14, 1996 ; edited by Thomas C. Sheahan and Victor N. Kaliakin
cosponsored by U.S. Geological Survey, Agricultural Research Service, Soil Conservation Serivce, Reston, Virginia, February 5-8, 1990 ; compiled by Madge Ertel