Discharge from a pipe line on steel pontoons, U.S. dredge Robert Mc Gregor on the upper Mississippi River in 1940.
Robert McGregor
Witthaus, WarrenHartford, John
1940
picture
Robert McGregor (Dredge)United States. War Department. Corps of Engineers\nRiver engineeringDredges
Missouri River
1940-1949
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Herman T. Pott National Inland Waterways Library