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Abstract Benjamin B. Thayer's company was organized to develop a mining technology or chemical compound called Thayer's Process. This collection includes two letters between 1860-1861 and articles of agreement: a letter to Theodore Winter from W.A. Gaston describes a steam engine and its operation. Another letter to B. B. Thayer from Joseph Mosheimer discusses the use of "Thayer's Process" in Silver Hill, Nevada. In the articles of agreement, Benjamin B. Thayer, Theodore Winter, Lewis A. Garnett, and...