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 faculty and students at Stange Memorial Clinic of Iowa State College were interested in a very unusual case that was brought to their attention on July 7, 1942. The patient was a thirteen- year-old brown mare that had shown general depression and impaired appetite for two weeks. Small subcutaneous swellings had developed during this time. The animal had been fed oats and red clover hay, and had access to bluegrass pasture.
Iowa State University Veterinarian: Vol. 5
, Article 3.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol5/iss2/3