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
On March 31, 1942 an eight-year-old Hereford cow was admitted to the clinic. No history of the case was obtained.
Calhoun, W. H.
"Squamous Cell Carcinoma of Horse and Cow,"
Iowa State University Veterinarian: Vol. 4
, Article 12.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol4/iss3/12