http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 online resource (247 pages, I page of plates) : illustrations, map.
Title from title screen (viewed June 27, 2014).
Includes bibliographical references and index.
Bulletin (Geological Survey (U.S.)) ; no. 351