http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 online resource (iv, 63 pages) : digital, PDF file, illustrations (chiefly color), color maps.
by Robert I. Tilling, Christina Heliker and Donald A. Swanson.
Title from PDF title page (viewed July 25, 2011).
Includes bibliographical references (pages 57-60).
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2010