Authors: H.
- Levi 1844-1911
- Levy, J. H. (Joseph Hiam) 1838-1913
- Lewer, Henry William -
- Lewes, George Henry 1817-1878
- Lewis, Abram Herbert 1836-1908
- Lewis, Edwin Herbert 1866-1938
- Lewis, H. Elvet (Howell Elvet) 1860-1953
- Lewis, Theodore Hayes 1856-
- Liddell Hart, Basil Henry, Sir 1895-1970
- Liisberg, H. C. Bering (Henrik Carl Bering) 1854-1929
- Lindberg, Hanna 1869-1909
- Lindlahr, Henry 1862-1924
- Lindley, H. Esselstyn -
- Lipsett, H. Caldwell 1868-1913
- Little, Henry M. -
- Littlejohn, Wolcott H. 1834-1916
- Lloyd, Alfred H. (Alfred Henry) 1864-1927
- Lloyd, Hannibal Evans 1771-1847
- Lock, H. O. (Henry Osmond) 1879-
- Lockwood, E. H. -
- Logeman, H. (Henri) 1862-1936
- Long, H. W. (Harland William) 1869-1943
- Longman, G. H. (George Henry) 1852-1938
- Long, Stephen H. (Stephen Harriman) 1784-1864
- Lord, Robert Howard 1885-1954
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