Woodward, Sherman M. (Sherman Melville), 1871-, Okey, Charles W. (Charles William), 1886-, United States. Office of Experiment Stations · Washington, D.C. : U.S. Dept. of Agriculture · leaf 40
Levee Constructed by Drag Line Excavator, Muscatine-LouisaLevee and Drainage District. Note earth barriers across borrow pit. Bui. 304, U. S. Dept. of Agriculture. Plate III … Fig. 1 .—Sluice Gate in Operation, One Gate Open, Des Moines CountyDrainage District No. 1.
Drainage · Pumping machinery
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