Available is this great booklet on horse drawn and human powered "Iron Age" circa 1913 Modern tools for garden and field.
1913 W.A Wilson & Sons Builder's Hardware Catalogue, Wheeling, West Virginia.
1916-17 Craddock-Terry Company Long Wear Shoes catalog
1937 Crump's Harness and Saddlery Catalog. This catalog has wonderful pictures of harnesses, saddles, bits, and everything else that you would need to rig up a horse.