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- Apennines (Italy)1
- Astronomers.1
- Astronomical instruments.2
- Astronomical observatories.[remove]4
- Astronomy--Observations.1
- Astronomy.2
- College campuses.1
- Hibben, John Grier, 1861-1933.1
- Jones, H. Spencer (Harold Spencer), 1890-1960.1
- Landscapes.1
- Ligurian Alps (Italy)1
- Milky Way.1
- Moon.2
- Physics.1
- Specola vaticana.1
- Telescopes.1