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EROSION PERFORMED BY THE ATMOSPHERE.
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watercourses. In northeastern Iowa its distribution shows such remarkable coincidences with the distribution of the primeval forests, as to only leave the uncertainty whether the loess is the cause of the growing of the forest or the forest the cause of the accumulation of the loess.[1]

J. A. Udden.

Augustana College,
Rock Island, Ill.

  1. ↑ See Pl. XXII and XLIV, Eleventh An. Rep. U. S. Geol. Survey. McGee.
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