http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Comparing participation in nutrient trading by livestock operations to crop producers in the Chesapeake Bay Watershed
1 online resource (6 unnumbered pages, 71 pages) : color illustrations.
Includes bibliographical references (pages 66-71.
Economic research report (United States. Department of Agriculture. Economic Research Service) ; no. 216