sponsors, California Division of Mines and Geology [and others] ; editor and chairman of organizing committee, Walter W. Hays ; compiled by Pamela D. Andriese
edited by David R. Soller ; convened by the Association of American States Geologists and the United States Geological Survey ; hosted by the Illinois State Geological Survey
edited by David A. Nimick and Paul von Guerard ; organized and prepared jointly with the Bureau of Land Management and the U.S. Department of Agriculture Forest Service