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Keywords
- Abbeys1
- Almucantar1
- Arabic language1
- Artedo, Petrus de1
- Ashkenazim1
- Astrolabes1
- Astronomical instruments1
- Astronomy, Arab1
- Belgium1
- Belgium--Nivelles1
- Busdraghi, Matteo, 14th century1
- Busdraghi, Nicola, 14th century1
- Busdraghi, Piero, 14th century1
- Catholic Church2
- Church history1
- Classification of sciences1
- Clergy1
- Clergy--Religious life1
- Collégiale Sainte-Gertrude (Nivelles, Belgium)1
- Commentaries1