ULAKBİM Belge Sağlama Verilerinin Analizi
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Abstract This study aims to determine the document delivery requests submitted to the Document Delivery Services Unit of the National Academic Network and Information Center (ULAKBİM). It concentrates on the journals and their age whence document delivery requests were filled. We tracked the data with regards to document delivery requests that were submitted to the Unit for two months. We found that the Documet Delivery Services Unit satisfied two-thirds (6.036) of a total of 9.213 document delivery requests submitted to the Unit during the two months' period of our study. Requests were satisfied from a total of 1.671 journal titles. Almost half (42%) of those journal titles were used only once for document delivery purposes. A small number (135) of "core" journals satisfied one-thirds (35%) of requests and the distribution of journals conforms to Bradford's Law of Scattering. Half (median) of all requests were satisfied from journal issues that were published within the last seven years. This indicates that more recent articles are requested much more heavily, which is parallel with the phenomenon of literature obsolescence. From submission to the mailing of the document, it took a total of 15 days to fill a document delivery request. Data regarding document delivery requests should be gathered for collection development purposes. It would then be possible to identify core journals and their back issues that should be acquired and maintained.