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
One of the most difficult problems of the practicing veterinarian is the diagnosis of toxic symptoms due to poisonous plants. Some plants produce in animals symptoms quite similar to those indicative of an infectious or non-infectious disease. Consequently, the diagnosis of plant poisoning apart from pathological conditions from other causes may be difficult.
Hatch, Ray D. and Massey, A. B.
"Plant Poisoning Of Livestock,"
Iowa State University Veterinarian: Vol. 8
, Article 4.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol8/iss2/4