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Astronomical instruments.
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2
Astronomical observatories.
2
Moon.
2
Apennines (Italy)
1
Astronomers.
1
Astronomy--Observations.
1
Astronomy.
1
Jones, H. Spencer (Harold Spencer), 1890-1960.
1
Ligurian Alps (Italy)
1
Milky Way.
1
Specola vaticana.
1
Telescopes.
1