Columbia subject headings:
Historic sites--United States--Guidebooks.
Transportation--Law and legislation--United States--History.
Transportation--United States--History.
Harvard subject headings:
Historic sites--United States--Guidebooks
Transportation--Law and legislation--United States--History.
Transportation--United States--History
Princeton subject headings:
Guidebooks.
Historic sites--United States--Guidebooks.
Transportation--Law and legislation--United States--History.
Transportation--United States--History.