The following books are available online, mostly used:
Folklore and the Sea (The American Maritime Library, Vol 6) by Horace Beck, November 1973
ISBN-10: 0913372366
ISBN-13: 9780913372364
Collection of legends, songs, superstitions, and stories both true and apocryphal which includes spectral ships, mermaids and mermen, pirates, sea language, sea monsters, navigation and weather lore, names on sea and shore and much more.
There are multiple copies of this at various prices--some quite resonable.
Seafaring Lore and Legend : A Miscellany of Maritime Myth, Superstition, Fable, and Fact
ISBN-10: 0071435433
List Price:$17.12
The Devil and the Deep: A Guide to Nautical Myths & Superstitions
ISBN-10: 1574090275
List Price:$ 6.85