Here are some interesting facts about books (from Peter Suber's blog): It's hard to count how many distinct books have ever been published but "the closest approximation" is WorldCat which, with a little refining, identifies 24 million. (Google's initial goal to digitize 15 million books, assuming no duplicates, puts it over the halfway mark.) 9.5 million books are only held by one library each. (Incredible. Digitization and OA would be like discovering a lost civilization.) Only 2.4 million books are held by more than 50 libraries each and only 301,000 are held by more than 500 libraries each. (Books are long-tail, both in distribution and demand. We need digitization and OA to overcome the limitations of even the largest print collections.) Now tell me "Should we not digitize all books?" Arun