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
Since June, 1941, five cases entering the college clinic have been definitely diagnosed as canine leptospirosis. It is highly probable that this disease is more prevalent than has previously been diagnosed.
"Leptospirosis in the Dog,"
Iowa State University Veterinarian: Vol. 6
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss1/9