| Save | Year | Entries | |
| Zoology -- Classification | 7 | ||
| Zoology -- Classification -- Amazon River : Patrick, Ruth | 1966 | 1 | |
| Clathraceae | 2 | ||
| Claude A. Barr (Firm) : Claude A. Barr (Firm) | 1952 | 1 | |
Your entry Clausewitz, Carl von, 1780-1831 would be here
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| Clavaria : Coker, William Chambers, | 1923 | 1 | |
| Clavariaceae | 3 | ||
| Claviceps -- See also Claviceps purpurea | 1 | ||
| Claviceps | c1999 | 1 | |
| Claviceps purpurea | 2 | ||
| Clavicipitaceae -- See also Cordyceps | 1 | ||
| Clavicle : Parker, William Kitchen, | 1868 | 1 | |
| Clavulinopsis -- North America : Petersen, Ronald H., | 1968 | 1 | |
| Clay -- See also Particles | 1 | ||
| Clay, C. M. 1810-1903 -- See Clay, Cassius Marcellus, 1810-1903 | 1 | ||
| Clay, Cassius Marcellus, 1810-1903 | 2 | ||
| Clay County (Ala.) -- Maps : McNutt, Robert Britton, | 1974 | 1 | |
| Soil surveys -- Alabama -- Clay County : McNutt, Robert Britton, | 1974 | 1 | |
| Soils -- Alabama -- Clay County -- Maps : McNutt, Robert Britton, | 1974 | 1 | |
| Clay family | 1899 | 1 | |
| Clay, H. 1777-1852 -- See Clay, Henry, 1777-1852 | 1 | ||
| Clay, Henry, 1777-1852 | 4 | ||
| Clay industries -- Washington (State) : Shedd, Solon, | 1910 | 1 | |
| Clay -- New York (State) : Brownell, Wayne E | 1951 | 1 | |
| Clay -- Therapeutic use : Rautureau, Michel, | 2017 | 1 | |
| Clay -- Washington (State) : Shedd, Solon, | 1910 | 1 | |
| Clayton, John, 1686-1773 : Berkeley, Edmund | c1963 | 1 | |
| Claytonia -- Classification : Miller, John M | 2006 | 1 | |
| Claytonia -- Identification : Miller, John M | 2006 | 1 | |
| Cleaning -- See also Bleaching | 1 | ||
| Cleaning : Howe, firm, chemist, Boston. (1864. Howe & Stevens) | c1864 | 1 | |
| Cleaning compounds -- See also Soap | 1 | ||
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Cleanliness -- See Hygiene --subdivision Care and hygiene under parts of the body, e.g. Foot--Care and hygiene; and subdivision Health and hygiene under classes of persons and ethnic groups |
1 | ||
| Botany -- Ireland -- Clear Island | 1996 | 1 | |
| Wild flowers -- Ireland -- Clear Island | 1996 | 1 | |
| Clearcutting -- Environmental aspects -- Blue Ridge Mountains | 2014 | 1 | |
| Clearcutting -- Environmental aspects -- Canada | c1993 | 1 | |
| Clearcutting -- Environmental aspects -- United States | c1993 | 1 | |
| Cleaveland, Clif, 1936- : Cleaveland, Clif, | c1998 | 1 | |
| Cleghorn, H. (Hugh Francis Clarke), 1820-1895 | 2 | ||
| Clematis | 11 | ||
| Clematis -- Catalogs : James I. George & Son (Nursery) | 1950 | 1 | |
| Clematis -- India -- Pictorial works : Gupta, A. L | 1961 | 1 | |
| Clematis -- Therapeutic use -- Early works to 1800 : Störck, Anton, | 1769 | 1 | |
| Clematis -- Varieties : McAllen, Monica | 2001 | 1 | |
| Clemens, Mary Strong, 1873-1968 : Ikenberry, Nelda B., | 2021 | 1 | |
| Clements, Edith Gertrude Schwartz, 1877-1971 : Clements, Edith Gertrude Schwartz, | c1960 | 1 | |
| Cleonidae -- See Curculionidae | 1 | ||
| Catholic Church -- Germany -- Clergy : Rhein, Alphons vom | 1891 | 1 | |
| Church of England -- Clergy : Walters, S. M. | 2001 | 1 | |
| Clergy -- England -- Biography : Walters, S. M. | 2001 | 1 | |