title: The origin and early history of the Mules operation.
mesh_terms: D000818:Animals; D001315:Australia; D005260:Female; D049672:History, 19th Century; D049673:History, 20th Century; D010502:Perineum / Q000601:surgery*; D012756:Sheep; D012757:Sheep Diseases / Q000517:prevention & control*; D013522:Surgery, Veterinary / Q000266:history*; D014730:Veterinary Medicine / Q000266:history*