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

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172. Copper; by F. L. Wideman.

174. Diatomite; by Benjamin Petkof.

176. Ferroalloys; by Gilbert L. DeHuff.

179. Gem stones; by Benjamin Petkof.

180. Graphite; by John W. Cole.