Graver, Dennis. PADI advanced dive manual / [electronic resource] / written by Dennis Graver, Robert Wohlers ; illustrated by Jim Mitchell, Jean Kester, photography by Dennis Graver, Robert Wohlers, Skin diver magazine, cover photo. by John Fine.. — Santa Ana, CA : : Professional Association of Diving Instructors,, c1980.. — vi, 234 p. : : ill. ; 24 cm.