Digital Geomorphological-GIS Map of the New York Harbor Islands (Governors, Ellis and Liberty Islands), New York (NPS, GRD, GRI, GATE, NYIS digital map)
Citation: Psuty, N.P., Hudacek, W., Schmelz, W.J. and Spahn, A. (2016). Digital Geomorphological-GIS Map of the New York Harbor Islands (Governors, Ellis and Liberty Islands), New York (NPS, GRD, GRI, GATE, NYIS digital map). National Park Service Geologic Resources Inventory Program.
Available at: NPS record