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For the record, the Google exec (Berthier Ribeiro-Neto) is the co-author of "Modern Information Retrieval" [1], an excellent book and close to a standard text on IR.

[1] http://www.amazon.com/Modern-Information-Retrieval-Ricardo-B...

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I can second the recommendation of that book, I've heard a lot of good things, though I haven't read it. It's recently been updated in a 2nd edition [1], though I have no idea if there are substantive changes, presumably, there are, given more than a decade has elapsed. If anyone's read the updated version, I'd appreciate knowing if and/or how the book's changed, I've been thinking about picking it up.

I have read pretty big sections of Manning's Introduction to IR, and it served me fairly well as an introduction to the field. It's available online.[2]

[1] http://www.amazon.com/Modern-Information-Retrieval-Concepts-...

[2] http://nlp.stanford.edu/IR-book/information-retrieval-book.h...

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