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Gale OneFile: Educator''s Reference Complete
Available from 01/01/1989 until 02/28/2011.
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Agricultural Science Database
Available from 01/01/1988 until 12/31/2012.
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JSTOR Biological Sciences Collection
Available from 1964 volume: 14 issue: 1.
Most recent 4 year(s) not available.
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JSTOR Life Sciences Collection
Available from 1964 volume: 14 issue: 1.
Most recent 4 year(s) not available.
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EBSCOhost Academic Search Complete
Available from 01/01/1992.
Most recent 1 year(s) not available.
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EBSCOhost Environment Complete
Available from 01/01/1992.
Most recent 1 year(s) not available.
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