http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Soil survey of Union County, South Dakota
South Dakota Agricultural Experiment Station
pages 473-508 : illustrations,map ; 24 cm.
by J. A. Kerr, W. I. Watkins, W. H. Pierre, and J. A. Machlis.