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 tranquilizing drugs have proven themselves a popular and successful means of chemical restraint. Under certain conditions they have many advantages over drugs formerly used for sedation. At this time the most successful tranquilizing drugs are the phenothiazine derivatives.
"Tranquilizers for Large Animals,"
Iowa State University Veterinarian: Vol. 21
, Article 8.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol21/iss1/8