At the same auction there were boxes of old law books that didn't sell. At the end of the day they were hauling them to the dumpster. I was helping with the cleanup, and grabbed a box and one of the books in box was different that the others, and looked old. I pulled it out, and it was a 1919 Fifth Edition Machinery's Handbook.
Good God! I bet that is fascinating. I have a number of reprints of old manuals & texts from Lindsay Publications, and it makes interesting reading.