Graybill, H.W. and Theobald Smith. "Production of fatal blackheda in turkeys by feeding embryonated eggs of heterakis papillosa." Reprinted from the Jounral of Experimental Medicine, May 1920.

Graybill, H.W. and Theobald Smith. "Production of fatal blackheda in turkeys by feeding embryonated eggs of heterakis papillosa." Reprinted from the Jounral of Experimental Medicine, May 1920., Box: 2. Veterinary Reprint and Pamphlet Collection, 24-4-3369. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/262662 Accessed December 25, 2025.