Map of Northern Section of New York City Water Supply System. From J.R. Smith's "Human Geography," Book I. Copyright, 1924, The John C. Winston Company. Map showing waterways and reservoirs supplying water to New York City north of Westchester County from Westchester through Greene County. Map includes the Hudson River, Schoharie and Ashokan Reservoirs and surrounding waterways.
New York State Archives. Education Dept. Division of Visual Instruction. Instructional lantern slides, 1911-1925, A3045-78, DnN7
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