Authors: P
- Almafuerte 1854-1917
- Alonso de la Avecilla, Pablo 1810-1860
- Alonso, Manuel A. (Manuel Antonio) 1822-1889
- Altenberg, Peter 1859-1919
- Alvarez y Tejero, Luis Prudencio -
- Amann, Paul 1884-1958
- American Academy of Political and Social Science -
- American Public Health Association. Laboratory Section -
- American Quartet -
- Amoreux, Pierre Joseph 1741-1824
- Amott, Lennox 1861-1909
- Anastasi, Peter A. -
- Anderson, Ada Woodruff 1860-1956
- Anderson, John Parker 1841-1925
- Anderson, Osborne P. (Osborne Perry) 1830-1872
- Anderson, Paul 1880-1956
- Anderson, Percy -1928
- Anderson, Poul 1926-2001
- Andrew, A. Piatt (Abram Piatt) 1873-1936
- Andrews, Matthew Page 1879-1947
- Andriessen, P. J. (Pieter Jacob) 1815-1877
- Angelis, Pedro de 1784-1859
- Angellotti, Marion Polk 1887-1975
- Anghiera, Pietro Martire d' 1457-1526
- Annet, Peter 1693-1769
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