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Start Over You searched for: Catalog Issue Year Decade 1940 - 1949 Remove constraint Catalog Issue Year Decade: 1940 - 1949 Sudoc Stem I 28.37/a Remove constraint Sudoc Stem: I 28.37/a

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163. Antimony; by Thomas P. Wootton.

164. Arsenic: by C. E. Nighman.

169. Bismuth; by C. E. Nighman.