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Start Over You searched for: Publish Year Decade 1960 - 1969 Remove constraint Publish Year Decade: 1960 - 1969 Sudoc Stem I 28.37/a Remove constraint Sudoc Stem: I 28.37/a

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21. Cobalt; [by Horace T. Reno].

26. Diatomite; [by Benjamin Petkof].

28. Ferroalloys; [by John L. Morning].

30. Gem stones, [by Benjamin Petkof].