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• Full text available at: SCIENCE Magazine
• Available from 1997 volume: 275.
  
• Full text available at: ProQuest Central
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: JSTOR Archival Journals and Primary Sources Collection
• Available from 01/03/1930 volume: 71.
  Available from 07/03/1880 volume: 1 issue: 1 until 12/27/1929 volume: 70.
  Most recent 6 year(s) not available.
  
• Full text available at: Biological Sciences
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Education Database [Proquest]
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Health & Medical Collection
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Materials Science Database
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Science Database
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Gale In Context: Opposing Viewpoints
• Available from 07/22/1983 until 12/23/2005.
  
• Full text available at: Gale In Context: Opposing Viewpoints
• Available from 07/22/1983 volume: 221 until 12/23/2005 volume: 310.
  

• Full text available at: SCIENCE Magazine
• Available from 1997 volume: 275.
  
• Full text available at: ProQuest Central
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: JSTOR Archival Journals and Primary Sources Collection
• Available from 01/03/1930 volume: 71.
  Available from 07/03/1880 volume: 1 issue: 1 until 12/27/1929 volume: 70.
  Most recent 6 year(s) not available.
  
• Full text available at: Biological Sciences
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Education Database [Proquest]
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Health & Medical Collection
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Materials Science Database
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Science Database
• Available from 01/01/1988 volume: 239 until 12/23/2005 volume: 310.
  
• Full text available at: Gale In Context: Opposing Viewpoints
• Available from 07/22/1983 until 12/23/2005.
  
• Full text available at: Gale In Context: Opposing Viewpoints
• Available from 07/22/1983 volume: 221 until 12/23/2005 volume: 310.