APA (7th ed.) Citation

Geological Survey (U.S.) & Simpson, R. W. (1986). Isostatic residual gravity, topographic, and first-vertical-derivative gravity maps of the conterminous United States. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Robert W. Simpson. Isostatic Residual Gravity, Topographic, and First-vertical-derivative Gravity Maps of the Conterminous United States. Reston, Va.: The Survey, 1986.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Robert W. Simpson. Isostatic Residual Gravity, Topographic, and First-vertical-derivative Gravity Maps of the Conterminous United States. The Survey, 1986.