Columbia subject headings:
Cooperative cataloging--United States--Data processing.
Exchange of bibliographic information--United States.
Machine-readable bibliographic data.
Online library catalogs--United States.
Recataloging--Data processing.
Retrospective conversion (Cataloging)
Harvard subject headings:
Cooperative cataloging--United States--Data processing.
Exchange of bibliographic information--United States.
Machine-readable bibliographic data.
Online library catalogs--United States.
Recataloging--Data processing.
Retrospective conversion (Cataloging)
Princeton subject headings: