Columbia subject headings:
Astronomy--Observations--Congresses.
Distances--Measurement--Congresses.
Earth (Planet)--Observations--Congresses.
Lunar laser ranging--Congresses.
Harvard subject headings:
Astronomy--Observations--Congresses.
Distances--Measurement--Congresses.
Earth (Planet)--Observations--Congresses.
Lunar laser ranging--Congresses.
Princeton subject headings:
Astronomy--Observations--Congresses.
Distances--Measurement--Congresses.
Earth (Planet)--Observations--Congresses.
Lunar laser ranging--Congresses.