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Science 3 March 1978:
Vol. 199. no. 4332, p. 934
DOI: 10.1126/science.199.4332.934-b
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Erratum

In the letter from Pietro U. Capurro, (17 Feb., p. 731), the first sentence of the second paragraph should have read, "The Galaxy Chemical Company's solvent recycling plant started operation in the Little Elk Valley in 1961."

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