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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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283. Gem stones; by Benjamin Petkof.

284. Gold; by J. P. Ryan.

285. Graphite; by Harold J. Drake.

286. Gypsum; by William R. Barton.

287. Helium; by Harold W. Lipper.

288. Iodine; by William C. Miller.