Update: Bought the $7 library sale box, found the exact 1988 guide I needed
Everyone was telling me to just hunt individual shelves, but I grabbed a random box of 40 books for $7 at the spring sale in Portland. Digging through it, I found this 1988 Oregon hiking guide that has every trail mile marker my newer maps miss. It's not about the rare finds, it's about volume when you're on a budget. Anyone else buy those mystery boxes instead of picking through the carts?