Artifacts References
I find this sort of material to be much more interesting than the endless rehashing of coral reefs, glowingly useless gear reviews, and "buoyancy tips" that fill up the standard glossy diving magazines.
Historical
Conservation Manual – Donny L. Hamilton
The Oxford Companion to Ships and the Sea
Peter Kemp, 1988
Lots of interesting information and trivia.
The Perfect Storm
Sebastian Junger, 1997
You saw the movie. The book is better.
Nautical
Two Years Before the Mast
Richard Henry Dana Jr., 1869
Detailed and literate sailor's account of a voyage on a square-rigger around Cape Horn and back in the 1850's.
Moby Dick
Herman Melville, 1851
Really needs no introduction. If you thought it was awful in high school, give this one another try now. Its much better than you remember. The story may be fiction, but the technical details are quite accurate.
Fictional
20,000 Leagues Under the Sea
Jules Verne, 1870
Still fun to read, and infinitely better than any of the movie adaptations. Verne predicted scuba diving, submarines, and nuclear power in the 1860s!
Other
Schooners and Schooner Barges
Paul C Morris
Lower Cape Pub., 1984
Railroad Ferries of the Hudson
Raymond Baxter, Arthur Adams
Fordham University Press., 1999