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Subject
- Water33
- Chemical industry26
- Corporations26
- Dow Chemical Company24
- Water quality18
- Advertising17
- Water--Softening16
- Advertising, Industrial15
- Water--Purification14
- Scientific apparatus and instruments13
- Water--Analysis12
- Magnesium9
- Magnesium industry and trade9
- Science--Study and teaching9
- Seawater9
- Water--Softening--Equipment and supplies9
- Chemistry8
- Magnesium alloys8
- Water quality--Testing8
- World War (1939-1945)7