Authors: J
- Haaren, John H. (John Henry) 1855-1916
- Haarhoff, T. J. (Theodore Johannes) 1892-1971
- Haas, Hippolyt Julius 1855-1913
- Haaxman, P. J. -
- Habberton, John 1842-1921
- Habermann, Johann 1516-1590
- Habington, William 1605-1654
- Hackett, James Thompson 1858-
- Hadamard, Jacques 1865-1963
- Hadden, J. Cuthbert (James Cuthbert) 1861-1914
- Hadermann, J. R. -
- Haensel, Johann Gottfried -
- Hägele, Joseph M. 1823-1892
- Hager, Hermann 1816-1897
- Hagfors, Johan Fridolf 1857-1931
- Haggard, J. Harvey (John Harvey) 1912-2001
- Hahl, Jalmari 1869-1929
- Haines, Alice Calhoun 1874-1965
- Hains, T. Jenkins (Thornton Jenkins) 1866-1953
- Haislet, John A. -
- Halbertsma, Justus Hiddes 1789-1869
- Haldane, J. B. S. (John Burdon Sanderson) 1892-1964
- Haldeman-Julius, E. (Emanuel) 1888-1951
- Haldeman-Julius, Marcet 1887-1941
- Hale, Edward Everett 1822-1909
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