Missing monographs are generally replaced unless other copies or editions are held in the MSU Libraries. Attempts will be made to replace missing items judged to be of particular value or interest locally, even if no longer in print. Gifts of appropriate materials are accepted from individual donors, and duplicate journal issues or serial reports offered by other institutions are sometime available to fill gaps in serial holdings. Filling serial gaps, renewing, and canceling serial subscriptions is part of an ongoing serials review process carried out by the Latin American Bibliographer. Multiple copies and identical or very similar editions are also reviewed for weeding as part of an ongoing collection renewal project in the Main Library general stacks.