Image: Physiographic provinces of the Mid-Atlantic region by NPS
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Description: Map showing the five geological provinces through which the Potomac River flows
Title: Physiographic provinces of the Mid-Atlantic region by NPS
Credit: https://www.nps.gov/pohe/learn/nature/geology.htm
Author: Katharine M Loughney
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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