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Start Over You searched for: Catalog Issue Year Decade 1930 - 1939 Remove constraint Catalog Issue Year Decade: 1930 - 1939 Sudoc Stem I 28.37/a Remove constraint Sudoc Stem: I 28.37/a

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312. Molybdenum; by Frank L. Hess.

313. Nickel; by C. E. Julihn.

318. Potash; by J. H. Hedges.