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Science 31 August 1979:
Vol. 205. no. 4409, p. 856
DOI: 10.1126/science.205.4409.856-b
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Erratum

In the article by W. V. Ligon, Jr., entitled "Molecular analysis by mass spectrometry" (13 July, p. 151), the sentence beginning on line 10, column 3, p. 157, read "The total sample weighed more than 100 micrograms." The sentence should have read "The total sample weighed less than 100 micrograms."

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