Spurr Josiah Edward (1870-1950) Atlas on the Geology of the Aspen District

Spurr, Josiah Edward (1870-1950) Atlas on the Geology of the Aspen District . Washington: [Printed by Julius Bien & Co., New York], 1898. Folio, twenty-seven color lithographic maps and geological cross sections, two of which are double-paged, in publisher's gilt-stamped cloth, 21 x 18 in. [with] George F. Becker's Atlas on the Geology of the Quicksilver Deposits of the Pacific Slope , Washington: [Giles Litho. & Liberty Printing Co., New York], 1887, thirteen maps and plans on twelve sheets, mostly printed in color, five double-page, in original cloth, slightly scuffed, sunned, 17 1/4 x 22 in. (2)