Columbia subject headings:
Harvard subject headings:
Canals--Maryland--Guidebooks.
Canals--Washington (D.C.)--Guidebooks.
Canals--West Virginia--Guidebooks.
Chesapeake and Ohio Canal (Md. and Washington, D.C.)--History.
Chesapeake and Ohio Canal National Historical Park--Guidebooks.
Princeton subject headings:
Chesapeake and Ohio Canal (Md. and Washington, D.C.)--History.
Chesapeake and Ohio Canal National Historical Park--Guidebooks.
Guidebooks.