http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 online resource (iv, 14 pages) : color illustrations
Title from title screen (viewed on Mar. 2, 2012).
Includes bibliographical references (pages 12-14).
Circular (Geological Survey (U.S.)) ; 1371