found: Work cat.: Community issues and Ohio's large livestock farms, 2002.
found: Ontario. Ministry of Agriculture and Food. Odour control on livestock and poultry farms, 2003.
found: The Florida handbook, 2000:p. 261 (general farms are further classified as primarily crop farms, primarily livestock farms, and general crop and livestock farms)
found: Economic geography, 1954:p. 268 (livestock farms, principally hog farms, beef-cattle farms; livestock farms constitute characteristic type of farm in much of the Corn Belt)
found: Nature's way, 2005:p. 235 (in addition to crop farms and suburban lawns, giant livestock farms are even larger contributors to growing dead-zone problem)