A book on "Medical Entomology." A technical book on forestry. A book about digging for treasure! That should be a good one. Battle Cry the first novel of Leon Uris...? A 1970's book on cooking in Nice and Provence. And a nice hunting book: Hunting Trophy Black Bear.
These small press hunting books have a significant following. Sold Goats and Goat Hunting to Colorado for $195 recently and I was the cheapest available globally...the book was out of Safari Press. Worth looking for.... I never pass on small press hunting books...the odder the animal hunted the more expensive the book...