In the book "Randall Made Knives" the author states that Bo Randall purchased a copy of "Tool Steel Simplified" in 1938 and that it quickly became "dog-eared and smudged from use." I received my copy this morning and quickly found why Bo cherished his copy. "Tool Steel Simplified" is probably one of the best investments I've made in a long time. Long out of print but the info contained within it's covers is just great. Quite in depth for a book that is titled "simplified." If you are a prospective knife maker and are contemplating forging yourself a blade this is a must have. Already my copy is covered with post-its.