Topographical map showing the entire water shed of Croton River above the Croton Aqueduct Dam : also the most available sites for storage reservoirs : from minute surveys made during the years 1857 and 1858
"Croton Aqueduct Board: M. van Schaick, Prest. Commissr., Theo. de Forest Asst. Commissr., A.W. Craven chief engineer; engineers: J.H. Morley in charge of survey in 1857, G.A. Cushing in charge of survey in 1858; asst. engineers: D.S. Crosby, Walter S. Church Jr., Thos. A. Emmet Jr., Benj. S. Church, Geo. S. Greene Jr."
New York Public Library. Dictionary catalog of the Map Division, v. 3, page 396, column 3, row 3
Related version published at a smaller scale of approximately 1:52,800.