Relief shown by contours and spot heights. "Prepared in cooperation with United States Department of Energy." "Prepared on behalf of U.S. Department of Energy (Interagency Agreement DE-AI08-76DP00474)." On envelope: "Prepared by the U.S. Geological Survey for the Nevada Operations Office, U.S. Department of Energy (Interagency Agreement DE-AI08-76DP00474)." Includes 2 diagrams.