- The Case of the Pocket Diary Found in the Snow (English) by Groner, Auguste, Frau
- The Case of the Pool of Blood in the Pastor's Study (English) by Colbron, Grace Isabel
- The Case of the Pool of Blood in the Pastor's Study (English) by Groner, Auguste, Frau
- The Case of the Registered Letter (English) by Colbron, Grace Isabel
- The Case of the Registered Letter (English) by Groner, Auguste, Frau
- Casey Ryan (English) by Bower, B. M.
- The Cash Boy (English) by Alger, Horatio
- Cashel Byron's Profession (English) by Shaw, George Bernard
- Cassell's Vegetarian Cookery - A Manual of Cheap and Wholesome Diet (English) by Payne, A. G.
- Cast Adrift (English) by Arthur, T. S. (Timothy Shay)
- The Castaway - Odd Craft, Part 2. (English) by Jacobs, W. W.
- Caste (English) by Fraser, William Alexander
- Castilian Days (English) by Hay, John
- Castle Craneycrow (English) by McCutcheon, George Barr
- The Castle Inn (English) by Weyman, Stanley John
- Castle Nowhere (English) by Woolson, Constance Fenimore
- The Castle of Otranto (English) by Walpole, Horace
- The Castle Of The Shadows (English) by Williamson, Alice Muriel
- Castle Rackrent (English) by Edgeworth, Maria
- Castle Richmond (English) by Trollope, Anthony
- Castles and Cave Dwellings of Europe (English) by Baring-Gould, S. (Sabine)
- Castles in the Air (English) by Orczy, Emmuska, Baroness
- Cast Upon the Breakers (English) by Alger, Horatio
- Le Côté de Guermantes, 3. Partie (French) by Proust, Marcel
- Le Côté de Guermantes — première partie (French) by Proust, Marcel
- C'Était ainsi... (French) by Buysse, Cyriel
- Catalanisches Streitgedicht zwischen En Buc und seinem Pferd (Catalan) by Foerster, Wendelin
- Catalanisches Streitgedicht zwischen En Buc und seinem Pferd (German) by Foerster, Wendelin
- Catalan's Constant [Ramanujan's Formula] (English) by Fee, Greg
- Catalan's Constant to 1,500,000 Places () by
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