Columbia subject headings:
Astrophysics--Congresses.
IUE (Artificial satellite)--Congresses.
Space astronomy--Congresses.
Harvard subject headings:
Astrophysics--Congresses
IUE (Artificial satellite)--Congresses.
Space astronomy--Congresses
Princeton subject headings:
Astrophysics--Congresses.
IUE (Artificial satellite)--Congresses.
Space astronomy--Congresses.