This book of Petroliana collectables has been written with everyone in mind from the novice collector, just getting started, all the way to the seasoned collector with hundreds of items already in his/her repertoire. This book can help those new to the hobby by giving them and idea of what is actually out there, how to identify their items, and how much they are worth. On the other end of the spectrum, I believe that for advanced collectors, they can use this book to refine their collecting skills. They can get a better idea of how to rate items and how condition and rarity can greatly affect value.