Encyclopedias, Almanacs, Transcripts, and Maps
- Adhab-Algal
- ADHD diet
- Adiabatic Heating
- Adjuration
- Adler, Margot (1946-)
- Admiral Richard Evelyn Byrd
- Adolescent nutrition
- Adolf Friedrich Johann Butenandt
- Adolf Kolbe
- Adolf Kussmaul
- Adolph Karl Heinrich Slaby
- Adoptive Masonry
- Adramelech
- Adrenals
- Adrenals
- Adriaan Blaauw
- Adriaan van den Spieghel
- Adriaan van Maanen
- Adriaen Anthoniszoon
- Adrian Auzout