Authors: Leo
- Benett, Léon 1838-1917 8 books
- Weismann, August 1834-1914 8 books
- Carpenter, Flora L. (Flora Leona) 1877-1963 8 books
- Coggins, Herbert Leonard 1881-1974 7 books
- Street, Julian 1879-1947 7 books
- Merrick, Leonard 1864-1939 7 books
- Schefer, Leopold 1784-1862 7 books
- Edwards, Leo 1884-1944 6 books
- Dalrymple, Leona 1884-1968 6 books
- Imbert de Saint-Amand 1834-1900 6 books
- Sancho Rayón, José León 1830-1900 6 books
- Leonard, Mary Finley 1862-1948 6 books
- Bloy, Léon 1846-1917 5 books
- Frank, Leonhard 1882-1961 5 books
- Hallström, Per 1866-1960 5 books
- Samarow, Gregor 1829-1903 5 books
- Cieza de León, Pedro de 1518-1554 5 books
- Raven-Hill, L. (Leonard) 1867-1942 5 books
- Trotsky, Leon 1879-1940 5 books
- Courtney, W. L. (William Leonard) 1850-1928 4 books
- Gilder, Jeannette L. (Jeannette Leonard) 1849-1916 4 books
- Alas, Leopoldo 1852-1901 4 books
- Tinseau, Léon de 1844-1921 4 books
- King, L. W. (Leonard William) 1869-1919 4 books
- Leone, Sergio (Illustrator) - 4 books
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