Columbia subject headings:
Light--Environmental aspects--Observations--Congresses.
Radio astronomy--Observations--Congresses.
Radio--Interference--Congresses.
Space debris--Congresses.
Harvard subject headings:
Airglow--Congresses.
Light pollution--Observations--Congresses.
Radio astronomy--Observations--Congresses.
Radio--Interference--Congresses.
Space debris--Congresses
Space pollution--Congresses.
Princeton subject headings:
Astronomy--Observations--Congresses.
Exterior lighting--Congresses.
Radio--Interference--Congresses.
Space pollution--Congresses.