The main focus of the book is on note serial number and prefix. The author have made extensive research on finding the highest possible prefix for every possible published note. His research have been supported by photographic documentation. There have been extensive coverage on split, mule and star note series. This part is extremely useful for serious collectors. The book also provides several tables with Prefix, Issuing Circle, Rarity (Scare, Rare and Very Rare) and along with the price of uncirculated (UNC), extra fine (EX) and very fine (VF). This is extremely useful for collectors.