http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
DERSAL, William R[ichard] van.- -- The land renewed. The story of soil conservation. By William R. van Dersal and Edward H[arrison] Graham. (2. print.) - New York: Oxford Univ. Press 1946. 109 S. 8° -- 1950:1077.