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 September 17, 1964, two western ewes were admitted to the Iowa State Veterinary Clinic. The two were part of a flock of 43 ewes, 23 lambs, and 1 buck, which all showed symptoms of scabies. The flock had been purchased about one year prior to examination.
Schilling, James R.
Iowa State University Veterinarian: Vol. 27
, Article 6.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol27/iss1/6