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Subject
Anthracite coal
1
Bridges
3
Buildings
1
Bus travel
1
Bus travel.
1
Central business districts
2
Coal
2
Coal slurry pipelines
1
Docks
1
Local transit
5
Manufactures
1
Mines and mineral resources
1
Postal zones
1
Produce trade
1
Railroad travel
1
Railroads
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30
Roads
7
Shipping
1
Street-railroads
2
Streets
1