Authors: C
- Clark, William 1770-1838
- Clark, William 1698-
- Clark, William George 1821-1878
- Clark, William H. 1840-1920
- Classen, E. (Ernest) 1881-1957
- Claudel, Paul 1868-1955
- Claudianus, Claudius -
- Claudy, C. H. (Carl Harry) 1879-1957
- Clauren, H. (Heinrich) 1771-1854
- Clausen, George 1852-1944
- Clausewitz, Carl von 1780-1831
- Clausius, R. (Rudolf) 1822-1888
- Claus, M. A. (May Austin) 1882-1976
- Clauson, J. Earl (James Earl) 1873-1937
- Claus, William A. J. (William Anton Joseph) 1862-1926
- Claxton, William J. -
- Clay, Albert Tobias 1866-1925
- Clay, Alice -
- Clay, Beatrice E. (Beatrice Elizabeth) -
- Clay, Bertha M. 1865-1922
- Clay, Charles Felix 1861-1947
- Clay-Clopton, Virginia 1825-1915
- Clayden, Arthur William 1855-1944
- Clay, Henry 1777-1852
- Clay, John Cecil 1875-1930
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