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 December 21, 1942, a three-year- old Guernsey cow was presented at the Stange Memorial Clinic. Several days previously the Iowa State College ambulatory clinic had been called by the owner to treat the cow for bloody diarrhea. The history obtained by the ambulatory clinician was that the entire herd was being fed ensilage and shredded corn stover, and that this was the only cow affected.
Rohwer, H. H.
"Hemorrhagic Enteritis in a Cow,"
Iowa State University Veterinarian: Vol. 5
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol5/iss3/13