- C.S. Hammond and Co (New York) (1)
- C.W. Davison (Minneapolis) (1)
- C.W.K. Gleerups Förlag (Lund) (1)
- Cable (Chicago, 1919) (1)
- Cable Co (Chicago, 1913) (1)
- Cadell & Davies (London) (2)
- Cadell & Davies, & Longman, Hurst, Rees & Orme (London) (1)
- Cadell & Davies; London (1)
- Cadell & Davies; Longman, Hurst, Rees, Orme, & Brown (London) (1)
- Caimo & C. (2)
- Calder and Boyars (London) (1)
- Calumet (Chicago) (1)
- Calumet Baking Powder Co (Chicago) (1)
- Calumet Baking Powder Co (Chicago, Ill, 1923) (1)
- Calumet Baking Powder Co. (Chicago) (1)
- Calvert Lithographing Co. (Detroit, Mich.), 1899 (1)
- Campbell (Boston) (1)
- Canada Bank Note Co (Montreal) (1)
- Canada Dept. of Mines, Geological Survey (Ottawä) (2)
- Canada Engraving & Lithograph Company, Ltd (Montréal) (1)
