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Vegetation Change and Arroyo Cutting in Southeastern
Arizona During the Past Century: An Historical Review.
Figure 4: The channel trench of the San Pedro,
northern Sonora

From:
James Rodney Hastings, Institute of Atmospheric Physics,
The University of Arizona.
Vegetation Change and Arroyo Cutting in Southeastern Arizona During
the Past Century: An Historical Review.
In Arid Lands Colloquia 1958-1959.University of Arizona.
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