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- United States. Department of Agriculture18
- ProQuest (Firm)17
- United States. Animal and Plant Health Inspection Service17
- United States. Congress. House. Committee on Agriculture. Subcommittee on Department Operations, Research, and Foreign Agriculture17
- Preece, Rod, 1939-16
- Bekoff, Marc15
- Swanson, Janice C.15
- United States. Congress. House. Committee on the Judiciary. Subcommittee on Crime, Terrorism, and Homeland Security15
- Linzey, Andrew14
- Oxford University Press14
- Anderson, Alexander, 1775-187013
- British Broadcasting Corporation13
- Francione, Gary L. (Gary Lawrence), 1954-13
- Catteau, Manuel12
- Jensen, D'Anna J. B.12
- Leslie, Madeline, 1815-189312
- Rollin, Bernard E.12
- United States. Congress. House. Committee on Agriculture. Subcommittee on Livestock and Grains12
- Wenger, Allan12
- American Humane Association11