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 June 28, 1946, a 3-year-old Hereford cow was admitted to Stange Memorial Clinic with the history of a tumor protruding from the vagina.
Howard, Richard T.
"Chronic Prolapse of the Vagina,"
Iowa State University Veterinarian: Vol. 9
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol9/iss1/9