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Subject
- Chemical industry496
- Corporations496
- Hercules Incorporated496
- Advertising, Industrial485
- Naval stores382
- Insecticides184
- Research, Industrial133
- Toxaphene106
- Insect pests74
- Pine oil68
- Cellulose industry58
- Gums and resins58
- Insect pests--Control58
- Cellulose51
- Explosives industry48
- Thanite46
- Explosives32
- Disinfection and disinfectants31
- Plastics industry and trade31
- DDT (Insecticide)30