W.B. Saunders Co. 818p. Sponenberg, D.P. 1995. A conservation breeding handbook . From the National Agricultural Statistics Service, Agricultural Statistics Board, USDA and provided through the USDA Economics and Statistics System , Albert R. Mann Library , Cornell University . Data from the 1982 and 1987 census is included for comparison.
Some data are more current than others.
Livestock Virtual Library Developed and maintained by the Department of Animal Science , Oklahoma State University . NetVet Veterinary Resources Developed and maintained by Ken Boschert, DVM, Washington University . Martindale's Health Science Guide - 1999. Developed and maintained by Jim Martindale with Frank Potter.