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Authors
- Abbe, Robert, 1851-19282
- Abernethy, John, 1764-18311
- Adami, J. George (John George), 1862-19262
- Adami, J. George (John George), 1862-1926 author1
- Adams, J. F. Alleyne (James Forster Alleyne), 1844-1914 author1
- Adler, Lewis H., Jr. author1
- Agassiz, Louis, 1807-18732
- Agnew, D. Hayes (David Hayes), 1818-18923
- Agnew, D. Hayes (David Hayes), 1818-1892 author1
- Air University (U.S.). Arctic, Desert, and Tropic Information Center, author.1
- Alarco, José L. (José Lino), 1835-1903 author1
- Albee, Fred H. (Fred Houdlett), 1876-19451
- Allen, Harrison, 1841-1897, author1
- Allen, J. Adams (Jonathan Adams), 1825-18901
- Alleyne, J. S. B. (Jeremiah Smith Bois), 1826-18951
- Allison, Charles C., author1
- Allison, H. E. (Henry Edward), 1851-1904, author1
- Ames, Azel, 1845-1908 author1
- Anderson, H. G.1
- Andrews, Edmund, 1824-19041