ISBN 0916974421 books & textbook
NAUI Textbook: For Entry Level Scuba Diver and Openwater I Scuba Diver Training Courses, 2nd Edition 2nd edition by Dennis Graver (1990) Paperback
National Association of Underw /1990T Paperback / 188 Pages
isbn-10: 0916974421 / isbn-13: 9780916974428
