A history of the United States of America; its people and its institutions . Colonial Steam-Plough. INDUSTRIAL CONDITIONS AND DEVELOPMENT. 529 convey it to market, great elevators store and load it onshipboard, and in a thousand ways the aid of invention hasbeen called in to decrease the labor and add to the produc-

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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidhistoryofuniteds07morr