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Collection Overlap in the Lcs Network in Illinois

The Library Computer System (LCS) computer network in Illinois contains machine-readable records representing the collections of each of the member academic libraries. Twenty-one of the twenty-two libraries in the LCS network as of 1983 agreed to participate in a study of collection overlap. A random sample representing about 1 percent of each collection was drawn. A procedure was devised to match and merge records that represented the same title; it proved to be more than 97 percent accurate. The significant findings were that a high percentage of titles, 69.46 percent, occurred only once in the network and that a percentage of the collection of each library, ranging from 6.1 percent to 68.4 percent, was unique to that library.