caption: Unknown illustrator, Jefferson Country Hog. From Harris, J. (1870). Harris on the pig. Breeding, rearing, management, and improvement. Orange Judd and company in the public domain.
Harris, J. (1870). Harris on the pig. Breeding, rearing, management, and improvement. New York, NY: Orange Judd and company.
Porter, V., & Mason, I. L. (2002). Mason’s World Dictionary of Livestock Breeds, Types and Varieties (5th ed.). Wallingford, Oxfordshire, UK: CABI Publishing.
Porter, V., Alderson, L., Hall, S. J. G., & Sponenberg, D. P. (2016). Mason’s World Encyclopedia of Livestock Breeds and Breeding: 2 Volume Pack (1st ed.). Wallingford, Oxfordshire, UK: CABI.
Youatt, W. (1860). The Pig. (S. Sidney, Ed.). London, UK: Routledge, Warne & Routledge.