SERVICE BRIDGE-PLAN ELEVATIONS AND SECTIONS OF SPANS. July 1931 - Mississippi River 9-Foot Channel Project, Lock and Dam No. 15, Upper Mississipi River (Arsenal Island), Rock Island, Rock Island County, IL; Army Corps of Engineers; Healy Company; Merrit-Chapman-Whitney Corporation; Ylvisaker, Lenvik; Piel, John H; McCormick, Herbert

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