 It was built of heavy flags of freestone, and in some parts, at least, covered with a bituminous cement, which time has made harder than the stone itself. In some places, where the ravines had been filled up with masonry, the mountain torrents, wearing...  The North American Review - Página 377editado por - 1847Visualização integral - Acerca deste livro
 | Nebraska State Historical Society - 1899 - 470 páginas
...parts at least, covered with a bituminous cement, which time has made harder than the stone itself. In some places where the ravines had been filled up with masonry, the mountain torrents, wearing it for ages, have gradually eaten a way through the base, and left the superincumbent mass — such... | |
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