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 number of reported brucellosis cases affecting humans dropped to a record low of less than 600 in 1961, a 90% decrease since 19650, latest figures compiled by the National Brucellosis Committee reveal.
Veterinarian, Iowa State University
"Human Brucellosis Decreases,"
Iowa State University Veterinarian: Vol. 26
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol26/iss1/9