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 five-year- old Guernsey cow was presented at the Stange Memorial Clinic with an extensive gangrene of the udder.
Nelson, Jack M.
Iowa State University Veterinarian: Vol. 8
, Article 14.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol8/iss1/14