Authors: Jose
- Leydenfrost, Robert J. 1925-1987
- Leyendecker, J. C. (Joseph Christian) 1874-1951
- Libby, Frederick J. (Frederick Joseph) 1874-1970
- Lightfoot, J. B. (Joseph Barber) 1828-1889
- Linck, Josef -
- Lincoln, Joseph Crosby 1870-1944
- Lindau, Wilhelm Adolf 1774-1849
- Liouville, Joseph 1809-1882
- Lippincott, Joseph Wharton 1887-1976
- Lister, Joseph, Baron 1827-1912
- Lockyer, Norman, Sir 1836-1920
- Lodge, Oliver, Sir 1851-1940
- Loesch, Frank J. (Frank Joseph) 1852-1944
- Loewenstein, Joseph E. -
- Long, William J. (William Joseph) 1867-1952
- Loopuit, Jos. 1864-1923
- Loring, Emilie Baker 1864-1951
- Loubat, J. F. (Joseph Florimond) 1831-1927
- Lovibond, Joseph W. (Joseph Williams) 1835-1918
- Lowndes, Robert W. 1916-1998
- Loxton, S. J. (Samuel Joseph) 1857-1922
- Lucas, Joseph -
- Luengo, José A. -
- Lumby, J. Rawson (Joseph Rawson) 1831-1895
- Lux, Joseph Aug. (Joseph August) 1871-1947
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