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
Studies on the use of penicillin in the treatment of mastitis are not yet complete. The results obtained to date are sufficiently encouraging, however, to warrant a preliminary statement regarding dosage and method of administration, although research still in progress may later result in minor changes in these recommendations.
Schalm, O. W.
"Recommendations for the Use of Pencillin in the Treatment of Bovine Mastitis,"
Iowa State University Veterinarian: Vol. 8
, Article 9.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol8/iss2/9