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Proc Natl Acad Sci U S A. 1998 Aug 18;95(17):9720-3.

Two empires or three?

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Professor Emeritus, Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA. emayr@oeb.harvard.edu
PMID:
9707542
PMCID:
PMC33883
[Indexed for MEDLINE]
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