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 2, 1944, an 8-month-old male Aberdeen Angus calf was presented at the Stange Memorial Clinic with the history of a growth in the scrotum which had increased rapidly in size in the last two months. The growth was present but small when the animal was born. The animal was in good condition when presented at the clinic. Examination revealed that the neoplastic growth was located in the distal end and the walls of the scrotum.
Syverson, C. L.
"Malignant Melanoma in a Calf,"
Iowa State University Veterinarian: Vol. 6
, Article 10.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss4/10