Free Kindle Coin, Currency and Stamp books.

All these books have 2010 or 2011 publication dates.
Warman's US Stamps Field Guide: https://www.amazon.com/dp/B00505RBHU
Warman's US Coins & Currency Field Guide (3rd edition): https://www.amazon.com/dp/B005061YVI
Warman's Companion US Coins & Currency (2nd edition): https://www.amazon.com/dp/B00505RBFC
Warman's US Coin Collecting: https://www.amazon.com/dp/B0044XV6LG