Dust and sand heaped up against fence windbreak. "Local drifting began almost
imperceptibly and finally merged with regional blowing."Prior to the 1930's
there had been a number of episodes of dust storms occurring in the Dust Bowl
area. In: "Erosion and Its Control in Oklahoma Territory," Angus H. McDonald,
Misc. Publication No. 301, Department of Agriculture. 1938. Figure 2. S21.A46.
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