Columbia subject headings:
Canals--Military aspects--United States.
Military roads--United States.
Roads--Design and construction--Military aspects--United States.
Harvard subject headings:
Canals--United States
Military roads--United States.
Roads--United States
Transportation, Military--United States.
Princeton subject headings:
Canals--United States--Military aspects.
Military roads--United States.
Roads--Design and construction--United States--Military aspects.