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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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281. Molybdenum; by R. W. Holliday.

282. Natural gas liquids; by I. F. Avery.

283. Natural gas; by Ivan F. Avery.

284. Nickel; by Glen C. Ware.

285. Nitrogen; by Richard W. Lewis.

286. Peat; by Eugene T. Sheridan.

287. Perlite; by Timothy C. May.

288. Phosphate rock; by Richard W. Lewis.

290. Potash; by Richard W. Lewis.