Columbia subject headings:
Astronomical instruments--Congresses.
Infrared equipment--Congresses.
Low temperatures--Congresses.
Optical instruments--Congresses.
Harvard subject headings:
Astronomical instruments--Congresses
Infrared equipment--Congresses.
Low temperatures--Congresses
Optical instruments--Congresses
Princeton subject headings:
Astronautics in astronomy--Congresses.
Infrared telescopes--Congresses.
Low temperatures--Congresses.
Optical instruments--Congresses.