Schalk, A.F. "Undulant fever in man and its relationship to abortion disease in cattle and swine." Agricultural Experiment Station North Dakota Agricultural College, April 1930., Box: 4. Veterinary Reprint and Pamphlet Collection, 24-4-3369. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/263184 Accessed April 07, 2026.