I was at a gun show recently and found some unusual Mosin-Nagant rifles, but didn't know enough to identify them and gauge their value. So I bought them just in case, and then I picked up a copy of Terence Lapin's The Mosin-Nagant Rifle. It was a pretty useful book to me (and my Civil Guard marked Finnish M/91), and I think it is a good addition to any gun library.

Pick up a copy at Amazon, and get learn the details you'll need to pick the really valuable Finnish cavalry carbine out of the sea of 91/30s at your next show!