http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Gravity data from the Sierra Vista Subwatershed, Upper San Pedro Basin, Arizona
1 online resource (iv, 26 pages) : illustrations, maps.
"Prepared in cooperation with The Nature Conservancy."
Includes bibliographical references (pages 25-26).
San Pedro River Watershed (Mexico and Ariz.)
U.S. Geological Survey open-file report ; 2015-1086