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 peculiar case of esophageal obstruction in a bovine was treated at the Stange Memorial Clinic during February. The patient, a 6-yearold Guernsey cow, was admitted to the Clinic on February 18, 1949.
Gubser, E. A.
"Foreign Body in the Esophagus of a Cow,"
Iowa State University Veterinarian: Vol. 11
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol11/iss3/13