Authors: J
- Lewis, James 1863-1939
- Lewis, James Campbell 1879-
- Lewis, J. Hardwicke (John Hardwicke) 1840-1927
- Lewis, John -
- Lewis, John 1858-1935
- Lewis, Joseph 1889-1968
- Lewis, J. Sydney -
- Leydenfrost, Robert J. 1925-1987
- Leyendecker, J. C. (Joseph Christian) 1874-1951
- Ley, J. W. T. (James William Thomas) 1879-1943
- Leyland, John 1857-1924
- Leys, John K. (John Kirkwood) 1846-1909
- Libbey, Laura Jean 1862-1924
- Libby, Frederick J. (Frederick Joseph) 1874-1970
- Liebig, Justus, Freiherr von 1803-1873
- Liefde, J. B. de (Jacob B.) 1847-1878
- Lie, Jonas 1833-1908
- Lightfoot, J. B. (Joseph Barber) 1828-1889
- Lightwood, James T. (James Thomas) 1856-1944
- Ligthart, Jan 1859-1916
- Li, Jen-shing -
- Lilla, Felix 1842-1905
- Lillie, John 1845-1925
- Lilly, John Cunningham 1915-2001
- Lima, Jaime de Magalhães 1859-1936
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