<https://collection.sciencemuseumgroup.org.uk/documents/aa110087624/translation-of-a-report-on-cerro-de-pasco-and-santa-rosa-mines>
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<https://collection.sciencemuseumgroup.org.uk/documents/aa110087624/translation-of-a-report-on-cerro-de-pasco-and-santa-rosa-mines>
<https://collection.sciencemuseumgroup.org.uk/documents/aa110087624>