http://www.thebeerbarrel.net/showthread.php?7953-The-National-Academies-Press-Makes-All-PDF-Books-Free-to-Download
"Our business model has evolved so that it is now financially viable to put this content out to the entire world for free," said Barbara Kline Pope, executive director for the National Academies Press. "This is a wonderful opportunity to make a positive impact by more effectively sharing our knowledge and analyses."
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