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Subject
- Water35
- Chemical industry25
- Corporations25
- Dow Chemical Company24
- Advertising17
- Water quality17
- Water--Softening16
- Advertising, Industrial15
- Scientific apparatus and instruments15
- Water--Analysis14
- Water--Purification14
- Magnesium9
- Magnesium industry and trade9
- Science--Study and teaching9
- Seawater9
- Water--Softening--Equipment and supplies9
- Magnesium alloys8
- Water quality--Testing8
- Chemistry7
- World War (1939-1945)7