Author
Alfred P. Sloan Foundation
1
American Cotswold Registry Association
1
American Hampshire Sheep Association
1
American Shropshire Registry Assn
1
Black Top Spanish Merino Sheep Breeders Publishing Association of Washington, Pa
1
Carter, Margaret H., 1896-
1
Fourie, P. J. J.
1
Hampshire-Down Breeders' Association of America
1
Levering, Mortimer, 1849-1908
1
Pearse, A. W. (Albert William), b. 1857
1
Rijksuniversiteit te Utrecht
1
Sveriges lantbruksuniversitet
1
Wad, Julia M.
1
Yazdi, M. Hossein
1