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operator: Internet Archive Internet Archive ID: cu31924022531390 described at URL: https://archive.org/download/cu31924022531390/cu31924022531390.pdf...
Archive Internet Archive ID: artificialpropag00ston described at URL: https://archive.org/download/artificialpropag00ston/artificialpropag00ston.pdf...
Internet Archive ID: monographsofunit291898geol described at URL: https://archive.org/download/monographsofunit291898geol/monographsofunit291898geol.pdf...
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atnorthofbearca00boll described at URL: https://archive.org/download/atnorthofbearca00boll/atnorthofbearca00boll.pdf determination method or standard: SHA-1...
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