Columbia subject headings:
Astronomical instruments--Congresses.
Optics, Adaptive--Congresses.
Harvard subject headings:
Astronomical instruments--Congresses--Congresses.
Astronomy
Astrophysics
Astrophysics--Congresses
Imaging systems in astronomy--Congresses.
Optics, Adaptive--Congresses.
Physical optics
Physics
Weights and measures
Princeton subject headings:
Optics, Adaptive--Congresses.