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Start Over You searched for: Author Mines Bureau Remove constraint Author: Mines Bureau Publish Year Decade 1920 - 1929 Remove constraint Publish Year Decade: 1920 - 1929

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173. Silica in 1925; by Frank J. Katz.

177. Cement in 1925; by B. W. Bagley.

180. Stone in 1925; by A. T. Coons.