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
There are over 63 million head of livestock that require veterinary inspection as they pass through the public stockyards over the country. It is the job of the veterinary i11spector to take a professional interest in every cow, pig, sheep or steer that enters the gates of these yards by truck, train or trailer.
Mau, Fred C.
"Veterinary Inspection at Public Stockyards,"
Iowa State University Veterinarian: Vol. 22
, Article 3.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol22/iss2/3