Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects
Agriculture--United States
Coal trade--United States.
National Grange--History.
Railroads and state--United States.
Railroads--United States
Princeton subject headings:
Agriculture--Economic aspects.
Agriculture--United States.
Coal trade--United States.
National Grange.
Railroads and state--United States.
Railroads--United States.