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 one and a half year old mixed breed female was referred to the clinic with a chronic cough. The referring veterinarian had removed a weed seed from the tonsilar crypt following which the animal showed transient improvement. Antibiotics and digitalis were administered with no evident response. The animal had never been vaccinated.
Peiffer, R. L. Jr.
"What's Your Radiographic Diagnosis?,"
Iowa State University Veterinarian: Vol. 34
, Article 9.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol34/iss3/9