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 2-year-old dwarf Aberdeen- Angus heifer was admitted to Stange Memorial Clinic on Dec. 1, 1950. The heifer was due to calve and the owner had anticipated the necessity of a Caesarean operation. The owner had intended to bring the animal to the clinic a few days before the onset of parturition, but the heifer was already in labor at the time of admittance.
"Caesarean Section in a Dwarf Cow,"
Iowa State University Veterinarian: Vol. 13
, Article 13.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol13/iss2/13