http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Comparison of Rambouillet, Corriedale, and Columbia sheep under intermountain range conditions
Comparison of sheep under range conditions
Washington, D.C. : U.S. Dept. of Agriculture, 1934
Circular (United States. Department of Agriculture) ; no. 308