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Scientific American, Vol. 68, No. 1 (1893) (1893)
leaf 7
suffering any appreciable stones lost over six percent. Sulphurous acid gas only between the grains contain a cementing material. amount of deterioration.” The other sandstones vary greatly from this. In This is found to be a clear, colorless silicious cement, so that the rock is virtually silica.… … © 1893 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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