An Arco How-To Book.
Copyright 1956 by Fawcett Publications, USA. 
First published 1958 by Arco Publishing, New York.
Hardcover, dustjacket, 142 pages, many mono photos throughout.
Starts of as usual with a history of diving, then equipment and technique, marine life, underwater vehicles (very interesting), underwater photography (several interesting housings shown), and then seventy-two pages of location diving, in the USA, Caribbean and Mediterranean. Quite interesting and of some historical  value no doubt.