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Show USE HOME LABOR. h Homo labor Is employed in c6n- It Crete bridges, and they are really a f part of the community in which thev L are built A large part of the labor f nereBsary In erecting a concrete I ; bridge is unskilled labor, and un- it skilled labor is besides less expensive I and more easily obtained than skilled L I j labor . Likewise modern machinery ; has reduced the labor of mixing and f ; transporting concrete from the gen- I eral gra.l pit until it is placed Into In-to the forms, cutting still further la bor costs oo . |