Subject
- Chemistry, Technical7
- Dow Chemical Company7
- Insecticides7
- World War (1914-1918)7
- Chemical apparatus6
- Chemical engineering6
- Chemical laboratories6
- Chemical laboratories--Equipment and supplies6
- National Aniline and Chemical Company6
- Pigments6
- Science--Experiments6
- Alchemy5
- Blasting--Equipment and supplies5
- Chemistry, Physical and theoretical5
- Coal-tar colors5
- DDT (Insecticide)5
- Farbenfabriken vorm. Friedrich Bayer & Co.5
- Home economics5
- Mendeleyev, Dmitry Ivanovich, 1834-19075
- Mineral industries5