Described is the file organization and design of an on-line catalog suitable for automation of one million books. A method of virtual hash addressing allows rapid search of the indexes to the catalog file. Storage of textual material in a compressed form allows considerable reduction in storage costs. (14 references) (Author/SJ)

On-line circulation systems divide into two types. One type contains records only for charged or otherwise absent items. The other contains a file of records for all titles or volumes in the library collection, regardless of their circulation status. This paper traces differences between the two types. (31 references) (Author)

Development and implementation of an off-line catalog card production system and an on-line shared cataloging system are described. An account is given of system design and equipment selection for the on-line system. File organization and programs are described, and the on-line cataloging system is discussed. (16 references) (Author/SJ)