Snorkeling: Here's How

Skin Diving with BP.
By James Joseph Gleeson
Skin Diving with BP.
Manual of Freediving: Underwater on a Single Breath
By Umberto Pelizzari, Stefano Tovaglieri
Manual of Freediving: Underwater on a Single Breath
The Rope-dancer
By Victor Marchetti
The Rope-dancer
Best Dives' Snorkeling Adventures: Bahamas, Bermuda, Turks & Caicos, Caribbean, Hawaii, Florida, Mexico, Galapagos and Australia
By Joyce Huber, Jon Huber
Vacation guide to the best snorkel-swimming and free diving spots in the Bahamas, Bermuda, Turks & Caicos, Caribbean, Hawaii, Florida, Mexico, Galapagos and Australia.
Snorkeling for Fun!
By Jessica Gunderson
An introduction to the history, types, gear, techniques, locations, and other elements in the activity of snorkeling, or skin diving.
Skin Diving and Snorkeling
By Barry Allen, George Cherry
Skin Diving and Snorkeling
Diving Guide to Underwater Florida
By Ned DeLoach
Diving Guide to Underwater Florida