Columbia subject headings:
Canals--Maryland.
Canals--Ohio.
Canals--Pennsylvania.
Chesapeake and Ohio Canal (Md. and Washington, D.C.)
Winchester, George, 1787-1840.
Harvard subject headings:
Canals--Maryland
Canals--Ohio
Canals--Pennsylvania
Princeton subject headings:
Canals--Maryland.
Canals--Ohio.
Canals--Pennsylvania.