Keywords
- Artedo, Petrus de1
- Artillery1
- Artisans--Taxation1
- Asceticism5
- Asceticism--Early church1
- Asia1
- Assumption of the Blessed Virgin Mary3
- Astrolabes5
- Astrology19
- Astrology, Iranian1
- Astrology, Roman1
- Astrometeorology1
- Astronomy39
- Astronomy, Ancient2
- Astronomy, Arab2
- Astronomy, Medieval6
- Astronomy--Tables1
- Athīr al-Dīn al-Abharī, al-Mufaḍḍal ibn ʻUmar, -1265. Hidāyat al-ḥikmah2
- Atlantic Ocean--English Channel1
- Atlases (Geographic)1