Figure 4.1 Physiographic Regions of North America (U.S. Geological Survey, 2003. Public Domain).

Figure 4.1 Physiographic Regions of North America (U.S. Geological Survey, 2003. Public Domain).

Source: U.S. Geological Survey, pubs.usgs.gov/imap/i2720/i2720_pamphlet.pdf
Public Domain Mark This work is in the Public Domain.

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