MARC formats Machine-readable bibliographic data 8 Data processing 4 Handbooks, manuals, etc 4 Automation 3 Libraries 3 Cataloging of nonbook materials 2 Exchange of bibliographic information 2 Authority files (Cataloging) 1 Bibliographical services 1 Cataloging of atlases 1 Cataloging of maps 1 Cataloging of serial publications 1 Cataloging, Cooperative 1 Congresses 1 Exhange of bibliographic information 1 History 1 Information storage and retrieval systems 1 Library information networks 1 Selective dissemination of information 1