Columbia subject headings:
Bituminous coal.
Coal--Transportation--United States.
Coal--United States--Transportation.
Interstate commerce--Cases.
Railroads--Freight--Rates--United States.
Railroads--Freight--United States.
Railroads--United States--Freight.
Railroads--United States--Rates.
United States. Interstate Commerce Commission.
Harvard subject headings:
Bituminous coal.
Coal--Transportation--United States
Interstate commerce--Cases.
Railroads--Freight--Rates--United States
Railroads--Freight--United States
United States. Interstate Commerce Commission.
Princeton subject headings: