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 seven year old Quarterhorse mare was presented with the owner's complaint that the animal was suffering infrequent bouts of coughing accompanied by retching and excessive salivation.
"What's Your Radiographic Diagnosis?,"
Iowa State University Veterinarian: Vol. 36
, Article 7.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol36/iss1/7