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
A 2 year old ewe of mixed breeding was presented at Stange Memorial Clinic Feb. 23, 1948. The animal had been in labor for 2 days, and the vaginal wall was everted.
Wilson, S. B.
"Cesarian Section in a Ewe,"
Iowa State University Veterinarian: Vol. 10
, Article 6.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol10/iss3/6