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 UPDATING SUCH LISTINGS, MAINTAINING AND AUTOMATICALLY UPDATING 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