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Wisconsin. Chief Geologist / Geology of Wisconsin. Survey of 1873-1879 ...
Volume III (1880)
Pumpelly, Raphael
Part II. Lithology of the Keweenawan system, pp. [27]-49 ff.
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Page [27]
PART II. LITIOLO GY OF THE KEWEENAWAN SYSTEM. BY RAPHAEL PUMPELLY.
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