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Interlibrary loan has traditionally been the main access to information beyond the individual library collection. The increase in access to document delivery services and full-text databases, however, has created the need to evaluate interlibrary loan services within the overall access environment. One of the most important factors in this evaluation concerns the cost to provide interlibrary loan. The purpose of this article is to provide the results of a study of one year's interlibrary loan expense at the Library at Wichita State University in Wichita, Kansas. The study was conducted to identify areas of greater and lesser interlibrary loan expense, and to serve as a comparison to the results of cost studies based upon data collected from large research libraries. The final results are also intended to serve as a reference point in determining how best to balance the use of interlibrary loan with commercial document delivery sources.