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Astronomical instruments --- Astronomie--Instrumenten --- Astronomie--Instruments --- Astronomische instrumenten --- Instrumenten [Astronomische ] --- Instruments [Astronomical ] --- Instruments d'astronomie --- Sterrenkunde--Instrumenten --- 521.03 --- Astronomy --- -Astrophysics --- -Astronomical physics --- Cosmic physics --- Physics --- Physical sciences --- Space sciences --- Theoretical astronomy. Celestial mechanics--?.03 --- Observations --- -Theoretical astronomy. Celestial mechanics--?.03 --- 521.03 Theoretical astronomy. Celestial mechanics--?.03 --- Astrophysics --- Astronomical physics --- Astronomical observations --- Observations, Astronomical --- Astrophysique --- Astronomie --- Observations.