Subject
- Abel, John Jacob, 1857-19383
- Abernethy, John3
- Ackerknecht, Erwin Heinz, 1906-19881
- Acland, Henry W., (Henry Wentworth), 1815-19001
- Adami, John George, 1862-19261
- Adams, William, 1820?-19001
- Addison, Thomas, 1793-18602
- Aesculapius1
- Agassiz, Louis, 1807-18731
- Agricola, Georg Andreas, 1672-17381
- Agrippa von Nettesheim, Heinrich Cornelius, 1486?-15351
- Airplanes2
- Airy, George Biddell, 1801-18921
- Akenside, Mark, 1721-17702
- Albinus, Bernhard Siegfried, 1697-17704
- Alcock, Rutherford, Sir, 1809-18701
- Aldrovandi, Ulisse, 1522-1605?2
- Alexander, John, 1891-19541
- Allen, Charles J.1
- Allen, Edgar van Nuys, 1900–19611
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