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GNIS: Oilfields, Mines, Dams, Towers, Man-made structures
The Geographic Names Information System (GNIS) actively seeks data from and partnerships with Government agencies at all levels and other interested organizations. The GNIS is... -
Bridge and Tunnel Entrances 2013
Bridges and Tunnel Entrances. The dataset contains polygons representing planimetric Roads, created as part of the DC Geographic Information System (DC GIS) for the D.C. Office...