Map showing wells drilled for oil and gas deeper than 20,000 feet in the conterminous United States and offshore [map] / Department of the Interior, U.S. Geological Survey ; compiled by K.I. Takahashi and K.I. Cunningham ; edited by K.L. Varnes
"Data modified from Petroleum Information Corporation, Well History Control Systems (WHCS) as of July 1983."
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