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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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141. Perlite; by Timothy C. May.

143. Potash; by Richard W. Lewis.

144. Pumice; by Timothy C. May.

148. Rhenium; by Richard F. Stevens, jr.

150. Silicon; by John W. Thatcher.