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
There is no doubt in the minds of many men connected with the dairy industry that bovine mastitis is the most important disease of the modern dairy cow. The problem of controlling this disease represents the biggest challenge the veterinary profession has ever had thrust upon it-a challenge even bigger than the problems of contagious pleuro-pneumonia and tuberculosis.
Daugherty, W. E.
"The Challenge of Mastitis Control,"
Iowa State University Veterinarian: Vol. 6
, Article 5.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol6/iss3/5