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
While performing an orchidectomy on a two month old lamb, the owner pointed out what he had considered a long standing wound under the left ear of the animal.
Christensen, L. T.
"An Anomaly in a Lamb,"
Iowa State University Veterinarian: Vol. 5
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol5/iss1/9