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
During the last meeting of the Western Montana Veterinary Medical Association, Doctor Patrick Hatfield from Victor, Montana, demonstrated a method for splitting the pelvic symphysis in the bovine.
Hamm, Ronald; Hammill, Doug; and Pisarik, Frank
"Pelvic Splitting in the Bovine,"
Iowa State University Veterinarian: Vol. 31
, Article 6.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol31/iss2/6