Keywords: Lock 2 plan of Great Falls Patowmack Canal.png en Drawing of Lock 2 Patowmack Great Falls Canal Great Falls VA HABS says HAER VA 30-GREFA 1B- sheet 1 of 1 - Potowmack Company Great Falls Canal Lock No 2 Great Falls Fairfax County VA LOC-image hhh va1446 Historic American Buildings Survey VA-13B 38 99806 -77 28861000000001 Patowmack Canal |