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Start Over You searched for: Catalog Issue Year Decade 1920 - 1929 Remove constraint Catalog Issue Year Decade: 1920 - 1929 Sudoc Stem I 19.8/a Remove constraint Sudoc Stem: I 19.8/a

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75. Strontium in 1923; by George W. Stose.

76. Petroleum in 1922; by G. B. Richardson.