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Re:Ask HN: Extracting book titles from comments by jmstfv on Wednesday April 26, 2017 @10:38AM (#14203333)
I was thinking about querying Google Books API to check if NNPs are book titles/authors, however, as you mentioned, NER produces a lot of entities. Luckily, there is Open Library dump[0] which has around 16 million book titles (IIRC) with some metadata.

[0] https://openlibrary.org/developers/dumps

Re:Ask HN: Extracting book titles from comments by thakobyan on Wednesday April 26, 2017 @11:42AM (#14203956)
I've been using Amazon Product API for Booknshelf (www.booknshelf.com) by passing "category => book" in the search to query only on Amazon Books. The book search by title is quite relevant. I thought this might be useful!