Digital mapping techniques '98 [electronic resource] : workshop proceedings : May 27-30, 1998, Champaign, Illinois / 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.
Imprint
[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey ; [Denver, CO : Branch of Information Services, distributor], 1998.