The Midwest Regional MEDLARS Center in Ann Arbor, Michigan which was established in April 1966 and terminated in April 1972 is described. The Center implemented MEDLARS Demand Search service in December 1967. During its years of operation, the Michigan MEDLARS Center formulated and released 4,823 Demand Searches. The searches originated from: the University of Michigan, 60%; other universities and colleges in the state, 24%; other state institutions, 14%; and out of state requests, 2%. The salient features of the entire contract period July 1967-April 1972 are presented in the appended tables. MEDLARS users may still request computer-produced searches. These are currently formulated on MEDLINE at the Reference and Interlibrary Loan Section of the University of Michigan Medical Center Library. (Author/NH)