[Collotype Rockwood Process views of scenery in the Third annual report of the department of public works of the city of
Martin B. Brown[Collotype Rockwood Process views of scenery in the Third annual report of the department of public works of the city of New York, for the year ending April 10, 1873]. Frontispiece.: Dam and reservoir at Boyd's Corners, Putnam Co. Length of dam on top, 700 feet. Depth of water in reservoir, 57 feet. Area of land flowed by reservoir, 278 acres. Storage capacity, 2,734,000,000 gallons / Rockwood process. Collotype. 24 x 14 cm.