#4 R. D. Schmickle of the U.S. Geological Survey prepares to operate a device that measures the speed of the Mississippi’s current on Feb. 22, 1936.

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#4 R. D. Schmickle of the U.S. Geological Survey prepares to operate a device that measures the speed of the Mississippi’s current on Feb. 22, 1936.

The Winter Walk: A Journey Across the Frozen Mississippi River, 1936

#4 R. D. Schmickle of the U.S. Geological Survey prepares to operate a device that measures the speed of the Mississippi’s current on Feb. 22, 1936.

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