The Dunning's Stepped Masonry dam, Pennsylvania

The Dunning's Stepped Masonry dam, Pennsylvania from the Article THE LOCATION AND CONSTRUCTION OF DAMS. By J. B. Johnson. from The Engineering Magazine DEVOTED TO INDUSTRIAL PROGRESS Volume X October 1896 NEW YORK The Engineering Magazine Co

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The Dunning's Stepped Masonry dam, Pennsylvania from the Article THE LOCATION AND CONSTRUCTION OF DAMS. By J. B. Johnson. from The Engineering Magazine DEVOTED TO INDUSTRIAL PROGRESS Volume X October 1896 NEW YORK The Engineering Magazine Co