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 Food and Drug Administration's Center for Veterinary Medicine warns that some animal drugs are being sold at discounted prices in Texas, Colorado, and Kansas in packaging that has been defaced. The practice may not be limited to these three states.
Iowa State University Veterinarian and American Veterinary Medical Association
"FDA Issues Warning About Defaced Drugs,"
Iowa State University Veterinarian: Vol. 50
, Article 4.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol50/iss2/4