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At this point, you should work with your library’s policies on how much to charge the Borrowing library. The CSU libraries do not charge each other for lost or damaged items, but you may want to charge libraries in other pods. There is currently no systemwide policy on what to charge libraries beyond the CSU, so you should follow local policies of your own library. Some libraries will have a set amount to charge for lost books, while others will search online for the cost of a replacement copy. Regardless of the route you take, you should find out the dollar amount to charge the Borrowing library for the lost book.
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