Columbia subject headings:
MARC formats.
Machine-readable bibliographic data.
OCLC Cataloging Subsystem.
Harvard subject headings:
Data tapes.
Libraries--Automation
Library information networks--United States.
Library science--Data processing
MARC formats--United States.
Machine-readable bibliographic data.
OCLC
Princeton subject headings:
Data tapes.
Libraries--Automation.
Library information networks--United States.
Library science--Data processing.
MARC formats--United States.
Machine-readable bibliographic data.
OCLC.