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 Oct. 20, 1954, a 6- month-old male Labrador was referred to the Stange Memorial Clinic. The history was an intermittent luxation occurring in the hip joints for the past 3 weeks.
"Coxa Plana (Legg-Perthes Disease),"
Iowa State University Veterinarian: Vol. 17
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol17/iss2/12