These are from Ibiblio, The Public’s Library and Digital Archive: http://www.ibiblio.org/ and http://www.ibiblio.org/hyperwar/USA/ref/
FM 2-5 Cavalry Drill Regulations, Horse: http://www.ibiblio.org/hyperwar/USA/ref ... /FM2-5.PDF
Fm 25-6 Dog Team Transportation: http://www.ibiblio.org/hyperwar/USA/ref ... FM25-6.PDF
FM 25-7 Pack Transportation: http://www.ibiblio.org/hyperwar/USA/ref ... FM25-7.PDF
The Mule, A Treatise on the Breeding, Training, and Uses to Which He May Be Put, Harvey Riley, Superintendent of the Government Corral, Washington, D.C, 1867: http://www.gutenberg.org/files/10878/10 ... 0878-h.htm
The Army Mule and Other War Sketches, Henry A. Castle: http://www.gutenberg.org/files/39911/39 ... 9911-h.htm