UNITED STATES DEPARTMENT OF THE EXTERIOR GEOLOGICAL SURVEY TWIN BUI l ьо -- - 73 MINUTE SERIES (PORNOGRAPHIC) 49° OO' 21000m 48°57'00‘ 62000m E Mapped, Edited, end Published by J. Werle Content by J. Homey Topography from serial pfiotoyrapfu by multiplex methods Aeruil pbotoyepht taken 1907
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