Columbia subject headings:
Harvard subject headings:
Cataloging--Data processing--Congresses.
Library science--Forecasting--Congresses.
Machine-readable bibliographic data--Congresses.
Online bibliographic searching--Congresses.
Online library catalogs--Congresses.
Princeton subject headings:
Cataloging--Data processing--Congresses.
Library science--Forecasting--Congresses.
Machine-readable bibliographic data--Congresses.
Online bibliographic searching--Congresses.
Online library catalogs--Congresses.