Columbia subject headings:
Astronomy--Environmental aspects--Congresses.
Radio--Interference--Congresses.
Space debris--Congresses.
Space pollution--Congresses.
Harvard subject headings:
Astronomy--Environmental aspects--Congresses.
Radio--Interference--Congresses.
Space debris--Congresses
Space pollution--Congresses.
Princeton subject headings:
Astronomy--Environmental aspects--Congresses.
Radio--Interference--Congresses.
Space debris--Congresses.
Space pollution--Congresses.