Popular science monthly . Below, a view of the retain-ing wall, which is threehundred and eighteen feethigh and one thousand sixhundred and seventy-fourfeet wide. The Washing-ton Monument, if set atthe outlet base of the dam,would rise above it only abare two hundred feet. Photo. © Int. FUm Son- 259 Building Houses for Birds—A

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872