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 Holstein cow, aged, 5 years, was admitted to Stange Memorial Clinic Oct. 4, 1947. The owner did not accompany the animal so an adequate history could not be immediately obtained. The only history elicited was that she had started to labor the preceding day and had not calved as yet. It was decided to perform a vaginal examination on her.
"Dystocia and Caesarean Section in a Bovine,"
Iowa State University Veterinarian: Vol. 10
, Article 14.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol10/iss2/14