The book owed more than a small debt to other texts. In fact, it owed so much of a debt that Poe was accused of plagiarism. (Apparently the publisher had chosen him, an unknown at that time, because he wouldn't be worth suing.)
Despite the controversy, the book was a great success.
(You can read Poe's other works at the Poe Society website. Make sure you've got supplies, though, because you'll be there a long time.)
EDGAR A. POE.