Most collectors don't need to be introduced to this referance book. However, if you're new to collecting, understand that this is considered by many, (if not most) collectors to be the MAIN referance book for older US large cents. It covers the years 1793-1814. The book was written in the 1940's, and updated a couple of times. The author goes to great length to describe the characteristics of the different die varieties for these years. Besides the descriptions, each one is also documented with a photograph. The photos are lacking at times, but they are quite helpful none the less. Bottom line, if you're interested in Large Cents, this material is required reading.