Today, if you want to access a typical out-of-print book, you have only one choice - fly to one of a handful of leading libraries in the country and hope to find it in the stacks.
Sergey BrinBut the vast majority of books ever written are not accessible to anyone except the most tenacious researchers at premier academic libraries. Books written after 1923 quickly disappear into a literary black hole.
Sergey Brin