I bought a copy of this book at the local flea market from a half-price book seller. It is a paperback of about 250 pages and I have been enjoying the pictures and articles on the history of USA mail delivery by motorized vehicle. Some of the chapters are for vehicles for city delivery, rural delivery, contractor, armored, highway post office, tractor-trailer, two-wheeler, three-wheeler, service, experimental, electric, and alternative fuel. I did not know there were several types of HPO vehicles, including a tractor-trailer version and a Super Twin stretch that was 15 feet longer than a normal bus. They even show a couple HPO crash pictures, but not much damage to the bus, the other vehicle must have lost that collision. I recommend this book for all of you motorheads on Stamporama.