ARCH ROCK' SAN FRANCISCO BAY. SCIENTIFIC AMERICAN. Geology of the Yukon Region. BY G. FREDERICK WRIGHT. The Independent N. Y. from veins of very low-grade ore. The geologists which the mails of next spring will reveal. VERTICAL SECTIONS THROUGH 'ARCH ROCK' SHOWING NATURAL TUNNEL WORN OUT BY ACTION OF WAVES. 'ARCH ROCK' IN SAN FRANCISCO BAY SHORTLY TO BE REMOVED BY THE GOVERNMENT., 97-09-11
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