Columbia subject headings:
Astronomy--Periodicals.
Geomagnetism--Periodicals.
Meteorology--Periodicals.
Harvard subject headings:
Astronomy--Observations--Periodicals
Geomagnetism--Observations--Periodicals.
Meteorology--Observations--Periodicals.
Princeton subject headings:
Astronomy--Observations--Periodicals.
Geomagnetism--Observations--Periodicals.
Meteorology--Observations--Periodicals.
Periodicals.