Sport diving the complete manual for skin and scuba divers
Balder, Alton Parker.
New York Collier Books London Collier Macmillan
1978
Previous ed.: published as 'The complete manual of skin diving'. New York : Macmillan, 1968 ; London : Macmillan, 1969
Bibliography: p.326-328. - Includes index
Scuba diving.
Skin diving.