Libraries have an entire concept of weeding, and numerous criteria for doing so: https://en.m.wikipedia.org/wiki/Weeding_(library) https://en.m.wikipedia.org/wi

Libraries have an entire concept of weeding, and numerous criteria for doing so: https://en.m.wikipedia.org/wiki/Weeding_(library) https://en.m.wikipedia.org/wiki/Weeding_(library) Libraries are constantly bringing in new materials and very few are capable of constantly increasing in size to match. I believe national libraries like the Library of Congress tend not to weed, but they do have to offload material to satellite locations and storage facilities.