In a separate thread, Aaron Novak posted about finding an old book about EAA Oshkosh, dating back in the '80s.
I love going through old book stores, and you can find some real gems. One book was written by current EAA author Budd Davisson, called "The World of Sport Aviation." It was published in 1982, and is a really neat snapshot of homebuilts, antiques, classics, and ultralights. You can often find this book in the used book stores...scarf it up!
Janes published a Guide to Homebuilt Aircraft in the 60s or 70s, and have been keeping my eyes open for a copy.
What other "book gems" have folks come across...or neat books to watch for?