- 2 Construction industry
- 75 Construction sites
- 29 Construction workers
- 1 Consumer protection
- 2 Consumer rationing
- 6 Consumers
- 20 Containers
- 1 Contentment
- 1 Contests
- 2 Continental Hotel
- 1 Continental Mfg. Co. Inks and Mucilages (Firm)
- 1 Continental Stable
- 2 Continental Theatre
- 9 Continental Worsted Mills (George Campbell & Co.)
- 2 Contour drawings (drawings)
- 2 Contractors
- 11 Contracts
- 1 Controls
- 5 Convalescent homes
- 7 Convents
- 2 Conversation
- 2 Convertibles
- 1 Conveying systems
- 2 Conveyors
- 1 Convicts
- 1 Conway Soap Factory
- 1 Cook, Captain James, 1778-1779
- 1 Cook, J. Bank
- 3 Cook, Son & Jenkins
- 3 Cookbooks
- 2 Cooke, T. P. (Thomas Potter), 1786-1864
- 2 Cookery (Starch)
- 1 Cookesley, John Moore
- 3 Cookies
- 1 Cooking baskets
- 6 Cooking utensils
- 4 Cooks
- 16 Cook's World's Ticket Office
- 1 Cooley Oil Works
- 10 Coolidge, John Calvin, Jr., 1872-1933
