Columbia subject headings:
SOHO (Artificial satellite)--Congresses.
Solar eclipses--1999--Congresses.
Sun--Active regions--Congresses.
Harvard subject headings:
SOHO (Artificial satellite)--Congresses.
Solar eclipses--1999--Congresses.
Sun--Active regions--Congresses.
Princeton subject headings:
SOHO (Artificial satellite)--Congresses.
Solar eclipses--1999--Congresses.
Sun--Active regions--Congresses.