U.S. Army Corps of Engineers, Baltimore District:
Water samples at Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
Electric conductivity test of water samples
U.S. Army Corps of Engineers, Baltimore District:
Georgetown Reservoir
U.S. Army Corps of Engineers, Baltimore District:
Dalecarlia Water Treatment Plant
U.S. Army Corps of Engineers, Baltimore District:
Meigs Vault at the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Graham visits Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Graham visits Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
Col. Chamberlayne visits with Washington Aqueduct staff
U.S. Army Corps of Engineers, Baltimore District:
BG Graham visits Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Graham visits Washington Aqueduct