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21
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Published 1960
Full text available from Agricultural Science Database: 04/01/2010 to presentFull text available from Biological Science Database: 04/01/2010 to present
Full text available from Continental Europe Database: 04/01/2010 to present
Full text available from Environmental Science Database: 04/01/2010 to present
Electronic
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Published 1990
Full text available from Research Library: 01/01/2011 to 01/31/2012
Electronic
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