Creator
- Chemical Publishing Company1
- Church, A. H. (Arthur Herbert), 1834-19151
- Clark, K. G.1
- Clarke, Frank Wigglesworth, 1847-19311
- Clason, George S. (George Samuel), 1874-19571
- Cleanliness Institute1
- Collins Printing House1
- Colton, J.W. (Firm)1
- Columbia University1
- Comar, C. L.1
- Consolidated Edison Company of New York, inc.1
- Constable1
- Cooley, Le Roy C. (Le Roy Clark), 1833-19161
- Cornish, George Anthony, 1901-19891
- Cramp, Arthur J. (Arthur Joseph), 1872-1
- Cranston & Stowe1
- Crittenden, C. H.1
- Croft, Terrell, 1880-19671
- Crosby Lockwood and Son1
- Croscup & Sterling1