http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Map showing wells drilled for oil and gas deeper than 15,000 feet in the conterminous United States and offshore
1 map : color ; 60 x 99 cm., on sheet 73 x 105 cm., folded in envelope 30 x 24 cm.
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."