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1. Hammond's Complete Map of New York City, 1917

1917. Digital Social Science Center (DSSC), Columbia University Libraries and C.S. Hammond & Company. This is a scanned version of the paper map entitled: Hammond's Complete Map of New York City. The map was scanned at 300 dots per inch and is in ... C.S. Hammond & Company.

2. Petersen's Rapid transit Map of Greater New York City, 1917

1917. Digital Social Science Center (DSSC), Columbia University Libraries and Ohman Map Co. This is a scanned version of the 1917 paper map entitled: Petersen's Rapid transit Map of Greater New York City. The original map was cut into two... Ohman Map Co.