Before barcodes became the favored means of charging out library books and tracking their return, libraries experimented with many different systems for keeping track of their inventory.  RFID tags may be the next big thing on the horizon, although many libraries are still finding them prohibitively expensive (ours included).

Many of the books in our General Collections, particularly those housed in the off-site Library Storage Building, retain relics of library charging systems past.

If you work in a library, do you come across these items of now-ephemera in your own collections?  What do you do with them — leave them in the book?  Discard them?  Remove them and archive them, or file them away to recycle as an art project?