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Subject Topical
- Coal218
- Education88
- Veterans84
- Economic development70
- Lungs--Dust diseases68
- Flood control65
- Gasoline64
- Outdoor recreation62
- Natural gas60
- Coal mines and mining51
- Reclamation of land--United States51
- Imports48
- Unemployment48
- Housing47
- Small business47
- Railroads46
- Women--Suffrage43
- Exports40
- World War, 1939-194539
- Water treatment plants37