[Longitudinal sections of Washington Aqueduct, Washington D.C. portion]
"To accompany report of Board of Experts on Washington Aqueduct Tunnel, etc." India and col. inks, watercolors. Watercolored on verso to show thru to recto. Soiled, stained, and fold-lined. Plate 1 includes note: Note, showing work up to November 1, 1888. Available also through the Library of Congress Web site as a raster image. Vault DCP
Graff, Frederick - Board of Experts on Washington Aqueduct Tunnel - Flad, Henry - Wilson, Joseph M.