Authors: w
- Lighton, William R. (William Rheem) 1866-1923
- Lillibridge, Will 1878-1909
- Lilly, William 1602-1681
- Lindau, Wilhelm Adolf 1774-1849
- Lindgren, Anton Wilhelm 1831-1901
- Lindsay, W. S. (William Schaw) 1816-1877
- Lindsey, William 1858-1922
- Linn, William Alexander 1846-1917
- Linskill, William Thomas -
- Linton, W. J. (William James) 1812-1897
- Lippincott, Joseph Wharton 1887-1976
- Lippmann, Walter 1889-1974
- Lithgow, William 1582-
- Litterer, Marie E. (Marie Ellen) 1925-2002
- Littlechild, Walter Poole -
- Littlefield, Walter 1867-1948
- Littlejohn, Wolcott H. 1834-1916
- Little, Mary Wallace Bundy 1857-
- Liu, Guang Wei -
- Livermore, Charles W. (Charles Walter) 1830-1889
- Livingstone, Richard Winn, Sir 1880-1960
- Livingstone, W. P. (William Pringle) 1864-1950
- Llewellin, W. (William), active 1811-1841 -
- Llewellyn -
- Lloyd, J. Wm. (John William) 1857-1940
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