Columbia subject headings:
Cataloging--Data processing--Handbooks, manuals, etc.
Machine-readable bibliographic data--Handbooks, manuals, etc.
UNBIS (Information retrieval system)
Harvard subject headings:
Cataloging--Data processing--Handbooks, manuals, etc.
Machine-readable bibliographic data--Handbooks, manuals, etc.
UNBIS (Information retrieval system)
Princeton subject headings:
Dag Hammarskjöld Library.
UNBIS (Information retrieval system)
United Nations--Information services.