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Start Over You searched for: Formats Still image Remove constraint Formats: Still image Subjects Wyoming Remove constraint Subjects: Wyoming Subjects Silicon Dioxide Remove constraint Subjects: Silicon Dioxide Subjects Geology Remove constraint Subjects: Geology Authors Russell, Andrew J., photographer Remove constraint Authors: Russell, Andrew J., photographer Copyright Public domain Remove constraint Copyright: Public domain Dates by Range 1850-1899 Remove constraint Dates by Range: 1850-1899

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