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Start Over You searched for: Publish Year Decade 1970 - 1979 Remove constraint Publish Year Decade: 1970 - 1979 Sudoc Stem I 28.37/a Remove constraint Sudoc Stem: I 28.37/a

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241. Manganese; [by Gilbert L. DeHuff].

243. Mica; [by Benjamin Petkof].

246. Molybdenum; [by Andrew Kuklis].

249. Nickel; [by Horace T. Reno].

250. Nitrogen; [by Ted C. Briggs].