1 "Fișier:Monographs_of_the_United_States_Geological_Survey_(IA_monographsofunit271896geol).pdf".

Fișier:Monographs of the United States Geological Survey (IA monographsofunit271896geol).pdf

Internet Archive ID: monographsofunit271896geol described at URL: https://archive.org/download/monographsofunit271896geol/monographsofunit271896geol.pdf...

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