document: Twenty years of the literature on acquiring out-of-print materials This article reviews the last two-and-a-half decades of literature on acquiring out-of-print materials to assess recurring issues and identify changing practices . The out-of-print literature is uniform in its assertion that libraries need to acquire o.p. materials to replace worn or damaged copies , to replace missing copies , to duplicate copies of heavily used materials , to fill gaps in collections , to strengthen weak collections , to continue to develop strong collections , and to provide materials for new courses , new programs , and even entire new libraries
doc_bio_tags: O O O O O O O O O O O O O O O O O O O O O O O O B I O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O