Columbia subject headings:
Stars--Observations--Congresses.
Telescopes--Automatic control--Congresses.
Telescopes--Congresses.
Harvard subject headings:
Astronomy--Congresses
Stars--Observations--Congresses.
Telescopes--Automatic control--Congresses.
Telescopes--Congresses
Princeton subject headings:
Stars--Observations--Congresses.
Telescopes--Automatic control--Congresses.
Telescopes--Congresses.