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