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 following is a summary of the results obtained from the examination of milk samples submitted by practicing veterinarians for mastitis diagnosis during the period Nov. 1, 1946 to Nov. 1, 1947.
Packer, R. A.
"Occurrence of Bacteria In Bovine Mastitis,"
Iowa State University Veterinarian: Vol. 10
, Article 7.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol10/iss1/7