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
On Dec. 13, 1951, a yearling Hereford bull was admitted to the Stange Memorial Clinic for treatment with a history of having been dehorned December 1. On December 12, the owner had noticed the area around the left eye swollen and had summoned a local veterinarian, who referred the case to the clinic.
"Suppurative Sinusitis Following a Dehorning Operation,"
Iowa State University Veterinarian: Vol. 14
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol14/iss2/12