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 22,1941, an eighteen-month old, male Cocker Spaniel was admitted to the Charles Henry Stange Memorial Clinic showing papillomata between the toes of both fore-feet. No history was obtained as to the rate of growth or the length of time the warts had existed.
Crundwell, J. B.
"Canine Infectious Papillomatosis,"
Iowa State University Veterinarian: Vol. 5
, Article 12.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol5/iss1/12