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
A 4- year-old Angus bull was admitted to Stange Memorial Clinic April 13, 1947, with a history of difficult urination.
"Urethral Calculti In A Bull,"
Iowa State University Veterinarian: Vol. 10
, Article 8.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol10/iss1/8