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
Robert R. Dappen, senior veterinary student at I.S.C. has used his ingenuity to advantage in foreseeing future use of an incubator he has designed and built. Dappen has been a student assistant for the Department of Veterinary Hygiene during the past four years and plans to use the incubator to aid him in culturing bacteriological media when he begins his veterinary practice.
"Home Made Incubator,"
Iowa State University Veterinarian: Vol. 12
, Article 18.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol12/iss2/18