I collect machinery and metal working books as well as any book that qualifies as useful "lost" technology. I found one the other day that gives information about the use of ropes in machinery drive systems instead of leather belts or chains. I've got books on muscle cars, knot tying, world timbers, plants, sewing, weaving, net making, chemical recipes, sailing, electrical engineering, all kinds of stuff. I didn't bother to take pictures of the SCI-FI book case.

I measure my collection by the ton.
Whoever dies with the most tools wins......Now accepting donations.