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Simpson, Michael G. (Michael George), 1953- (Nombre personal)
Checklist of the vascular plants of San Diego County, via WWW, Apr. 12, 2005: home page (Michael G. Simpson; Dr. Michael G. Simpson, Dept. of Biology, San Diego State Univ.)
OCLC, Apr. 12, 2005 (hdgs.: Simpson, Michael G.; Simpson, Michael G. (Michael George), 1953- ; usage: Michael G. Simpson)