Columbia subject headings:
SOHO (Artificial satellite)--Congresses.
Sun--Observations--Congresses.
Sunspots--Congresses.
Harvard subject headings:
SOHO (Artificial satellite)--Congresses.
Sun--Observations--Congresses.
Sunspots--Congresses.
Princeton subject headings:
SOHO (Artificial satellite)--Congresses.
Sun--Observations--Congresses.
Sunspots--Congresses.