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
by U.S. Geological Survey ; prepared in cooperation with the Federal Geographic Data Committee, Geological Data Subcommittee, and the Association of American State Geologists
Date
1995
Series
U.S. Geological Survey open-file report ; 95-525-C