1. Areas of historical oil and gas exploration and production in the conterminous United States [cartographic material] Yale Public content 1998. 2002-06-01T04:00:00Z. 2016-07-20T21:08:17Z. Mast, Richard F. (Richard Frederick), 1931-. U.S. Dept. of the Interior, U.S. Geological Survey. English. cartographic image. Public. United States, U.S., and United States.