Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
The term "Hereford" no longer refers specifically to the white-faced cattle that are seen the country over. A new breed of swine, the Hereford breed, has been developed with body color conforming to that of the Hereford breed of cattle.
Scott, A. Mack
Iowa State University Veterinarian: Vol. 3
, Article 3.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol3/iss2/3