1 "Ficheiro:Monographs_of_the_United_States_Geological_Survey_(IA_monographsofunit191892geol).pdf".

Ficheiro:Monographs of the United States Geological Survey (IA monographsofunit191892geol).pdf

Internet Archive ID: monographsofunit191892geol described at URL: https://archive.org/download/monographsofunit191892geol/monographsofunit191892geol.pdf...

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