Columbia subject headings:
Harvard subject headings:
Cold War--Diplomatic history.
Denmark--Foreign relations--United States.
Denmark--Politics and government.
Geophysics
Greenland--Environmental conditions.
Greenland--History
Scientists--Denmark.
Scientists--Greenland.
United States--Foreign relations--Denmark.
United States--Politics and government.
Princeton subject headings:
Cold War.
Greenland--Environmental aspects.
Greenland--Research.
Greenland--Strategic aspects.