Authors: th all
- Heywood, Thomas -1641
- Hiatt, Charles 1869-1904
- Higginson, Thomas Wentworth 1823-1911
- Hildebrand, Theodor 1794-1859
- Hildibrand, Henri Théophile 1824-1897
- Hildyard, Henry John Thoroton 1846-1916
- Hiles, Theron L. -
- Hill, Thomas -
- Hill, Thomas George 1876-1954
- Hill, William Thomson 1875-
- Hines, Thomas Henry 1838-1898
- Hinkle, Thomas C. (Thomas Clark) 1876-1949
- Hippel, Theodor Gottlieb von 1741-1796
- Hiscox, Edward T. (Edward Thurston) 1814-1901
- Hoare, Thomas W. -
- Hobbes, Thomas 1588-1679
- Hodgkin, Henry T. (Henry Theodore) 1877-1933
- Hodgkin, Thomas 1831-1913
- Hodgson, Fred T. (Frederick Thomas) 1832-1919
- Hodson, Thomas -
- Hoffmann, Andreas Gottlieb 1796-1864
- Hoffmann, E. T. A. (Ernst Theodor Amadeus) 1776-1822
- Hogg, Thomas Jefferson 1792-1862
- Holbach, Paul Henri Thiry, baron d' 1723-1789
- Holcomb, Thomas A. E. (Thomas Addis Emmett) 1831-1897
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