Dickinson, E. O., and R. C. Piper. “Some Current Research on the Emphysema-Adenomatosis Complex of Cattle”. The Bovine Practitioner 1971, no. 6 (November 1, 1971): 48–49. Accessed September 23, 2024. https://bovine-ojs-tamu.tdl.org/bovine/article/view/218.