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
Men will always love beauty and a beautiful horse will always arouse the fancy and admiration of horsemen and laymen alike. To them nothing is more awe-inspiring than matched and intelligent horses. Horses skilled in acting are usually found only in the circus, but occasionally an individual will delight in owning and training a trick horse. When a number of such men are brought together by this mutual interest, the arrangement that results may well lead to something unique in that it deals with living creatures by nature of different conformation, temperament, and capability.
Melles, L. H. and Boll, L. F.
"The White Horse Patrol,"
Iowa State University Veterinarian: Vol. 6
, Article 6.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss3/6