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Federal
Administrative Boundaries Centroids of National Park System Units NGDA
Department of the Interior —
National Park Service unit points. -
Federal
Hydrographic and Impairment Statistics Database: HAMP
Department of the Interior —
Hydrographic and Impairment Statistics (HIS) is a National Park Service (NPS) Water Resources Division (WRD) project established to track certain goals created in... -
Federal
HAMP Ridgely 1829 Landholdings
Department of the Interior —
Polygon web layer depicting the presumed 1829 extent of Ridgely family landholdings in present-day Baltimore County, Maryland. The presumed 1829 boundary polygon was... -
Federal
HAMP Buildings Polygon py
Department of the Interior —
Polygon web layer documenting buildings at Hampton National Historical Site.