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Ritchie, Charles Fisher (1922) A Colorimetric Determination of Hydrocyanic Acid. Bachelor's thesis, California Institute of Technology. doi:10.7907/WNXG-ZT76. https://resolver.caltech.edu/CaltechTHESIS:06112015-155708716

Ritchie, Charles Fisher (1922) An Investigation on the Production of Sodium Thiosulfate from Trona. Bachelor's thesis, California Institute of Technology. doi:10.7907/Y01W-T284. https://resolver.caltech.edu/CaltechETD:etd-06242004-143142

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