- Allen, Stephen, 1767-18523
- Allen, Thomas.1
- Allen, William, 1784-18681
- Allison, Joseph J.1
- Almshouse and House of Employment (Philadelphia, Pa.)1
- Alverson, Laban.1
- Amator, author2
- American Medical Association, author.1
- American Medical Association.1
- American Medical Association. Committee on Practical Medicine.1
- American Medical Association. Committee on Public Hygiene.1
- American Medical Association. Committee on Surgery, author.1
- American Philosophical Society.1
- American Philosophical Society. Library, compiler.1
- American Temperance Society.1
- Americano, Domingos Marinho de Azevedo, 1813-18511
- Ames, S.1
- Amos, Corbin, 1784-18661
- Amussat, J.-Z. (Jean ZuleĢma), 1796-18562
- Anderson, Andrew, d. 18391