Dune Progress
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“Diagram of the progress of a dune, from a to be. The arrow flies with the wind. A live tree standing before the dune when it is at a will be buried by the advance to b. Another tree, previously killed and still covered by the dune, will be brought to light when it has reached b.” -Johnson, 1910
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DunesSource
Grove Karl Gilbert and Albert Perry Brigham An Introduction to Physical Geography (New York, NY: D. Appleton and Company, 1910)
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