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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1973 Oct;70(10):3009–3035. doi: 10.1073/pnas.70.10.3009

Directory of the National Academy of Sciences of the United States of America.

PMCID: PMC427159  PMID: 4583028

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