Columbia subject headings:
Harvard subject headings:
Arctic regions--Climate--Congresses.
Ionosphere--Congresses.
Meteorology--Antarctica--Congresses.
Meteorology--Arctic regions--Congresses.
Princeton subject headings:
Arctic regions--Climate--Congresses.
Ionosphere--Congresses.
Meteorology--Antarctica--Congresses.
Meteorology--Arctic regions--Congresses.