| Save | Year | Entries | |
| Cicadas -- Life cycles : Kritsky, Gene | 2024 | 1 | |
| Cicadas -- Ohio : Kritsky, Gene | 1999 | 1 | |
| Cicadas -- United States : Kritsky, Gene, | 2021 | 1 | |
| Cicadellidae -- See Leafhoppers | 1 | ||
Your entry cicero, marcus tullius. hortensius would be here
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| Cichoriaceae : Bischoff, Gottlieb-Wilhelm, | 1851 | 1 | |
| Cichoriaceae -- Classification : Gutiérrez, Diego G., | 2015 | 1 | |
| Cicuta | 10 | ||
| Cider | 5 | ||
| Cider -- Early works to 1800 | 5 | ||
| Cider -- Great Britain : Knight, T. A. | 1822? | 1 | |
| Cider -- History : Janik, Erika | 2011 | 1 | |
| Cider -- United States | 3 | ||
| Cider vinegar -- Therapeutic use : Denis-Dumont, | 1 | ||
| Cielo (Mexico : Reserve) -- Bibliography : Perrine, John D | 1994 | 1 | |
| Cigar industry : Wágner, Ladislaus von, | 1871 | 1 | |
| Cigarets -- See Cigarettes | 1 | ||
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Cigarette habit -- See Smoking --subdivision Tobacco use under classes of persons and ethnic groups |
1 | ||
| Cigarette industry -- United States -- History : Kluger, Richard | c1997 | 1 | |
| Cigarette smoke Physiological effect -- See Tobacco Physiological effect | 1 | ||
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Cigarette smoking -- See Smoking --subdivision Tobacco use under classes of persons and ethnic groups |
1 | ||
| Cigarettes | 2 | ||
| Cigarettes -- History : Hobhouse, Henry | 2004 | 1 | |
| Cigarettes Physiological effect -- See Tobacco Physiological effect | 1 | ||
| Cigars : Leuchs, J. C. | 1856 | 1 | |
| Cile -- See Chile | 1 | ||
| Cilia and ciliary motion : Weiss, Rosalie Hedwig, | 1933 | 1 | |
| Cilia and ciliary motion -- Congresses | 1982 | 1 | |
| Ciliata : Buisson, Jean, | 1923 | 1 | |
| Ciliated protozoa -- See Ciliata | 1 | ||
| Ciliophora -- See Ciliata | 1 | ||
| Cimeliidae -- See Geometridae | 1 | ||
| Cimicifuga -- See Bugbane | 1 | ||
| Cinanteco Indians -- See Tzotzil Indians | 1 | ||
| Cinchona | 48 | ||
| Cinchona alkaloids -- See also Quinidine | 1 | ||
| Cinchona alkaloids : Markham, Clements R. | 1880 | 1 | |
| Cinchona bark : Flückiger, Friedrich A. | 1884 | 1 | |
| Cinchona bark -- Therapeutic use : Markham, Clements R. | 1880 | 1 | |
| Cinchona bark -- Therapeutic use -- Early works to 1800 : Crawford, Matthew James, | 2016 | 1 | |
| Cinchona -- Classification | 2 | ||
| Cinchona -- Colonization : Bélanger, Pierre, | 2021 | 1 | |
| Cinchona -- Economic aspects : Bélanger, Pierre, | 2021 | 1 | |
| Cinchona -- History | 3 | ||
| Cinchona -- India : Markham, Clements R. | 1880 | 1 | |
| Cinchona -- Peru -- Origin : Markham, Clements R. | 1880 | 1 | |
| Cinchona -- Pictorial works : Delondre, A. | 1854 | 1 | |
| Cinchona -- Political aspects : Bélanger, Pierre, | 2021 | 1 | |
| Cinchona -- Seeds -- Collection and preservation -- Peru : Markham, Clements R. | 1880 | 1 | |
| Cinchona -- Therapeutic use : Berg, O. C. | 1865 | 1 | |
| Cinchona -- Therapeutic use -- Periodicals | 1882 | 1 | |