Keywords
- Aringhello, Tommaso di1
- Arithmetic--Study and teaching1
- Armaiolo, Puccino1
- Armaleoni, Benedetto degli1
- Armies1
- Arnaldus, de Villanova, -13111
- Arrighi family1
- Arrigo, Simone d'1
- Arrigucci family1
- Arrigucci, Caterina1
- Arrigucci, Luigi1
- Artedo, Petrus de1
- Artisans--Taxation1
- Ashburnham, Bertram Ashburnham, Earl of, 1797-18781
- Asia1
- Astrology, Arab1
- Astrology, Roman1
- Astronomical instruments1
- Astronomy, Ancient1
- Astronomy--Popular works1