http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
American Geographical Society of New York
Rev. using new sources available through May 1971.
prepared by the American Geographical Society with support from the National Science Foundation ; compiled by Campbell Craddock, the University of Wisconsin.
"This geologic map is an outgrowth of the preparation of Geologic maps of America, folio 12 of the Antarctic map folio series."