topic

• Water-supply12
• Aqueducts11
• Watersheds7
• Cities and towns4
• Reservoirs4
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name

• New York (N.Y.). Aqueduct Commission7
• Welcke, Robert A6
• Chas. Hart & Sons4
• New York (State). Board of Health4
• Newton, Isaac, 1837-18843
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collection

• Maps of New York City and State17

place

• New York (State)14
• Croton River Watershed (N.Y.)11
• New York11
• Westchester County7
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genre

• Maps17
• Topographic maps2

publisher

• Aqueduct Commission4
• State Board of Health4
• Aqueduct Commission?2
• Croton Aqueduct Board2
• Photo-lith by Robert A. Welcke2
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division

• Map Division17

type