Over 4000 books of the National Academies Press are available as free PDFs

As of June 2, 2011, all PDF versions of books published by the National Academies Press (NAP) will be downloadable to anyone free of charge. There are more than 4,000 books plus future reports produced by NAP–publisher for the National Academy of Sciences, National Academy of Engineering, Institute of Medicine, and National Research Council.

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