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Federal
Classes of land-surface form in the United States recent views
Department of the Interior —
This digital dataset describes classes of land-surface form in the conterminous United States. The source of the data is the map of land-surface form in the 1970... -
State
Oregon Channel Migration recent views
State of Oregon —
Channel migration is the natural process by which streams move laterally over time. It is typically a gradual phenomenon that works over many years to effect...