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 | Aqueducts (11) |
| | Banquets (feasts) (1) |
| | Boats (3) |
| | Boats and boating (3) |
| | Boy Scouts (2) |
| | Buildings (4) |
| | Canals (6) |
| | Cannons (artillery) (1) |
| | Canoes and canoeing (1) |
| | Chesapeake and Ohio Canal (41) |
| | Chesapeake and Ohio Canal National Historical Park (1) |
| | Children (6) |
| | Cyclists (3) |
| | Dogs (2) |
| | Farm buildings (1) |
| | Fishing (4) |
| | Flowering dogwood (3) |
| | Flowers (5) |
| | Fort Frederick State Park (Md.) (1) |
| | Geese (1) |
| | Kayaks (2) |
| | Lift net fishing (2) |
| | Locks (Hydraulic engineering) (25) |
| | Natural landscapes (15) |
| | People (3) |
| | Potomac River (1) |