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North Elevation of Power House Showing Arrangement of Floodlights (10), February 1930
Pencil-on-vellum drawing, 29-3/4x24-3/4 inches
Drawer 10, Folder 4
Details of Addition to Present Tunnel (13), 4/28/1930
Pencil-on-vellum drawing, 27-3/4x36 inches
Drawer 10, Folder 4