Columbia subject headings:
Constitutional law--United States.
Interstate commerce.
Railroad law--United States.
Railroads--United States--Rates.
Harvard subject headings:
Constitutional law--United States
Interstate commerce
Interstate commerce--United States
Railroad law--United States.
Railroads--Freight--Rates--United States
Princeton subject headings:
Constitutional law--United States.
Interstate commerce.
Railroad law--United States.
Railroads--Freight--Rates--United States.