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 STRATA IN MIDDLE PART OF GATUN FORMATION ON EAST SIDE OF GATUN THIRD LOCKS EXCAVATION, CANAL ZONE
Thenumbeed nitscorespod to thesof te tigaphi second. Photogrph byGeoogical Section, Special Engiu1ecrinf, DiviioRn, Panam~aCana~lCompany.


GEOLOGICAL SURVEY