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Scientific American, Vol. 46, No. 19 (1882) (1882)
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us surveys have been and 2 feet in thickness. made from time to time for the The iron shoes, to which the purpose of’ finding easy grades an@ vood alignment, but with no columns are fastened, are embed- ded in the copings. and each sne definite results until two years ago, when it was proposed by… … © 1882 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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