Allen JW, Bateman KG, Viel L, Rosendal S, Shewen PE. The Microbial flora of the upper and lower respiratory tracts of feedlot calves with undifferentiated bovine respiratory disease. Bov. pract. [Internet]. 1991 Sep. 1 [cited 2024 Sep. 2];1991(26):162-5. Available from: https://bovine-ojs-tamu.tdl.org/bovine/article/view/2356