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 Oct. 23, 1952, a five-year-old Holstein cow was admitted to the Stange Memorial Clinic, Ames, Iowa. According to the history she had freshened six weeks previously and for the past three weeks had been eating hay but no grain. The general condition of the animal was poor.
"Adenocarcinoma of the Bile Ducts,"
Iowa State University Veterinarian: Vol. 15
, Article 15.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol15/iss2/15