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 four year old grey Arabian stallion was admitted to Stange Memorial Clinic, Oct. 4, 1948. The history submitted by the owner stated that the animal had a "lump" on the ventral surface of the left mandible. This "lump" was first noticed when the horse was a yearling and it had been increasing in size ever since.
Hacecky, R. M.
"Exostosis of the Mandible,"
Iowa State University Veterinarian: Vol. 11
, Article 6.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol11/iss1/6