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Science 5 August 1977:
Vol. 197. no. 4303, p. 545
DOI: 10.1126/science.197.4303.545
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Erratum

The cost of semiconductor grade silicon was incorrectly stated as $65 per ton (29 July, p. 446). The correct figure is $65 per kilogram.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)