This is an excellent book to start a firearms library with. It has a lot of great information for a very affordable cost – I found my copy for $3 at a gun show, but it can be bought on Amazon for not much more.
http://www.forgottenweapons.com/book-review-the-book-of-rifles-by-w-h-b-and-joseph-e-smith
At Forgotten Weapons I think the most interesting guns out there are the most obscure ones. I try to search out experimental and prototype weapons and show you how they work, in addition to more conventional guns that you may not have heard of before. You’re much more likely to find a video on the Cei Rigotti or Webley-Fosbery here than an AR or Glock. So, do you want to learn about something new today? Then stick around!