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
The pleasure or luxury horse is rapidly coming into the picture. With the coming of this city-kept and fed horse by owners who know very little about feeding and caring for horses, troubles are inevitable. Disturbances of nutritional origin will make their appearance and, in fact, have already made their appearance.
Rohwer, H. H.
"Repulsion of Cheek Teeth,"
Iowa State University Veterinarian: Vol. 6
, Article 13.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss2/13