http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
iii, 74 pages : illustrations, maps ; 24 cm.
by Robert A. Young and Joseph T. Haun, with key to the genera by F.A. McClure.
Agriculture handbook (United States. Department of Agriculture) ; no. 193