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U.S.GEOLOGICAL SUR VEY
11AP SHOVVL~G DISTRIBUTION OF CREVICES AND LOCATIONS OF SPECIAL l\'fAPS IN THE LIPPER lVllSSISSIPPI \CJ\LLEY ZINC AND LEAD REGION
Area (\f Wisconsin map::;
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S c<:de wmiles
========~~~~~~ 1906
Plates in this report G~~'l,~~ \ 1-"'-1 ----
Crevices
BU LLE.TIN NO. 294 PL. VII