The New York Public Library has one of the largest public collections in the world. But, unlike Amazon, it does not have seemingly infinite storage. Every book must earn its place on crowded shelves. Nothing gets there by accident. With millions of books to choose from, the library often gets asked how a book gets on the shelves.
From How the N.Y. Public Library Fills Its Shelves (and Why Some Books Don’t Make the Cut) – The New York Times