If you’re old enough, you might recall how libraries used to have card catalogs. This was back before you could look stuff up on the computer – back when all the information about a book was on little 3×5 cards. Now that the catalog is on computers, the cabinets that used to hold those cards aren’t much use anymore.
Library Card Catalog Cabinets Used For eReader Storage
Librarian Finds New Use For Card Catalog Cabinets