best books for diving instructors

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gas-planning-for-scuba-divers-diving-gas-management
Scuba Gas Planning: Gas Management For Divers
ultimate-guide-to-horizontal-trim-for-divers
Mastering Horizontal Diving Trim: An Effortless Balancing Act
sidemount band height andy davis
How To Find The Perfect Height For Your Sidemount Tank Bands
ultimate-guide-to-the-risks-of-scuba-diving-dangers-hazards
The Risks of Scuba Diving: Understanding the Hidden Dangers Underwater