Relief shown by contours and spot heights. "Generalized geology by D.K. Maurer, 1979. Geophysics by D.H. Schaefer and D.K. Maurer, 1980." "Base from U.S. Geological Survey, Lovelock and Vya, 1:250,000, 1970." Title on edge of envelope: Bouguer gravity mpa, Black Rock Desert, Nevada. Includes location map.