- Society for Animal Protective Legislation55
- Stevens, Christine51
- Animal Welfare Institute49
- United States. Congress24
- Regan, Tom20
- United States. Department of Agriculture11
- Cohen, Carl, 1931-8
- North Carolina State University -- History8
- North Carolina State University. College of Agriculture and Life Sciences. Department of Communication Services8
- Singer, Peter, 1946-7
- National Anti-Vivisection Society6
- Rawls, John, 1921-20025
- American Society for the Prevention of Cruelty to Animals4
- American Veterinary Medical Association3
- Darwin, Charles, 1809-18823
- Gandhi, Mahatma, 1869-19483
- Humane Society of the United States3
- American Anti-Vivisection Society2
- American Medical Association2
- Animal Defence and Anti-Vivisection Society2