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
The office of the ambulatory clinicians of the veterinary clinic at Iowa State College received a call on Jan. 21, 1950, from the college swine herdsman concerning the castration of five mature herd boars. The following equipment was prepared:
1. Large, flat, stainless steel pan
2. Bard-Parker handle and hooked blades
4. Hard twist manila rope, 1/2 in. x 12 ft.
5. Large turkish towel
6. Chloroform, three 1/4 lb. bottles
Cowles, R. J.
"Chloroform Anesthesia in the Castration of Boars,"
Iowa State University Veterinarian: Vol. 12
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol12/iss2/13