Columbia subject headings:
Bureau international de l'heure--History--Congresses.
Coordinates, Polar--Congresses.
Earth (Planet)--Rotation--Congresses.
International Earth Rotation Service--History--Congresses.
International Latitude Service--History--Congresses.
Latitude variation--Congresses.
Polar wandering--Congresses.
Harvard subject headings:
Bureau international de l'heure--History--Congresses.
Coordinates, Polar--Congresses.
Earth (Planet)--Rotation--Congresses.
International Earth Rotation Service--History--Congresses.
International Latitude Service--History--Congresses.
Latitude variation--Congresses.
Polar wandering--Congresses.
Princeton subject headings:
Latitude variation--Congresses.
Polar wandering--Congresses.