Masato posted a link to this online book:
Sea songs and ballads (1906)

Author: Stone, Christopher, 1882-1965

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The sea song book is just the tip of the iceberg, if you will. archive.org is a huge collection of books, movies, sound files, and whatnot - all available for free download. A search for Ballads and Songs will give you an idea - even Brewster's Ballads and Songs of Indiana is available for download.
-Joe Offer-