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• 
  Online resource available at: JSTOR Access Initiative
• Available from 03/01/1974 volume: 1 issue: 1.
  Most recent 6 year(s) not available.
  
• 
  Online resource available at: JSTOR Biological Sciences Collection
• Available from 03/01/1974 volume: 1 issue: 1.
  Most recent 6 year(s) not available.
  
• 
  Online resource available at: JSTOR Ecology and Botany I
• Available from 03/01/1974 volume: 1 issue: 1.
  Most recent 6 year(s) not available.
  
• 
  Online resource available at: JSTOR Life Sciences Collection
• Available from 03/01/1974 volume: 1 issue: 1.
  Most recent 6 year(s) not available.
  
• 
  Online resource available at: Wiley Online Library All Journals Show license Hide license
• Available from 1996 volume: 23 issue: 1.
  
• Open Access version of full text found via: Unpaywall

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