http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
General soil map Maricopa County, Arizona
U.S. Soil Conservation Service in cooperation with Natural Resource Conservation Districts in Maricopa County.
Accompanied by index: General soil map with soil interpretations for land use planning / by G.W. Hartman. 49 pages ; 27 cm.