35 CIRCULATION CONTROL SERVICES FOR LIBRARY HOLDINGS OF BOOKS AND RELATED ARTICLES-NAMELY, LEASING, INSTALLING, AND MAINTAINING CIRCULATION CONTROL SYSTEMS, DEVELOPING CODED LISTINGS OF LIBRARY HOLDINGS AND UP-DATING SUCH LISTINGS, MAINTAINING AND AUTOMATICALLY UP-DATING INVENTORY LISTINGS OF LIBRARY HOLDINGS, AND AUTOMATIC PROCESSING AND REPORTING OF CIRCULATION DATA AND RELATED INFORMATION OF LIBRARIES BY A HOST COMPUTER AT A CENTRAL STATION SERVICING PLURAL REMOTE CIRCULATION CONTROL SYSTEM INSTALLATIONS