I just started reading The Official Red Book "A Guide Book of Flying Eagles and Indian Head Cents". This is a must read for anyone who collects these coins. The author Richard Snow shares a wealth of knowledge about these two series. I have the Breen Encyclopedia and it is also a great reference book. However, this book is much smaller in size and gives great detailed information for each date and back round information that makes this book a joy to read. I have also purchase several of the other books in this series. I hope the rest will be as good as this one. That is my two cents worth. Richard