U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct
U.S. Army Corps of Engineers, Baltimore District:
BG Tickner visits the Washington Aqueduct