Subject
- Chlorine3
- Chloroprene1
- Chocolate1
- Chromatographic analysis1
- Church, A. H. (Arthur Herbert), 1834-19151
- Church, James Robb, 1866-19231
- Cipher and telegraph codes1
- Civil defense2
- Civil defense readiness1
- Clarke, Frank Wigglesworth, 1847-19311
- Clearing of land1
- Climatic changes1
- Coal--Analysis1
- Coal-tar colors5
- Coal-tar products4
- Coconut oil1
- Cod-liver oil1
- Cod-liver oil--Therapeutic use1
- Coffee1
- Coffee brewing1