Book (Scuba Diving History): Erving’s World Wide Skindiver’s Guide

Well-Used paperback  Vintage Scuba Diving, published 1968

Value: $25 

Features dive shops and "air stations" worldwide, information about shipwrecks, cave and lake diving back when double-hose regulators were the norm, and an annual subscription to Skin Diver magazine was just $5. Dive equipment of 50 years ago appears primitive compared to what is used today, and the cost of both gear and training was far less in those early days of diving.