Authors: Leo
- Cieza de León, Pedro de 1518-1554
- Coggins, Herbert Leonard 1881-1974
- Coimbra, Leonardo 1883-1936
- Collier, Nate 1883-1961
- Conant, Levi L. (Levi Leonard) 1857-1916
- Courtney, W. L. (William Leonard) 1850-1928
- Couturier, Léon 1842-1935
- Cox, Leonard -
- Crane, Leo 1881-1960
- Creagan, Leo F. 1879-1974
- Curmer, L. (Henri Léon) 1801-1870
- Cushag 1852-1937
- Custine, Astolphe, marquis de 1790-1857
- Dalrymple, Leona 1884-1968
- Dalton, Leonard V. (Leonard Victor) 1887-1914
- Dauphin, Léopold 1847-1925
- Dawson, William Leon 1873-1928
- Deich, L. G. (Lev Grigor'evich) 1855-1941
- Delboeuf, Joseph-Remi-Leopold 1831-1896
- De Leon, Daniel 1852-1914
- De Leon, Solon 1883-1975
- De Leon, T. C. (Thomas Cooper) 1839-1914
- Del Rey, Lester 1915-1993
- Deslandes, L. (Léopold) 1796-1850
- Dickson, Leonard E. (Leonard Eugene) 1874-1954
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