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21
Publicado em 1992
Full text available from Agricultural Science Database: 01/01/2008 to presentFull text available from Career & Technical Education Database: 01/01/2008 to present
Full text available from East Europe, Central Europe Database: 01/01/2008 to present
Full text available from Engineering Database: 01/01/2008 to present
Recurso Eletrônico
Periódico
22
Publicado em 2000
Full text available from Agricultural Science Database: 01/01/2003 to present
Recurso Eletrônico
Periódico
23
24
Publicado em 2004
Full text available from East Europe, Central Europe Database: 01/01/2017 to 01/31/2018
Recurso Eletrônico
Periódico
25
26
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28
Publicado em 2009
Full text available from East Europe, Central Europe Database: 01/01/2011 to presentFull text available from Education Database: 01/01/2011 to present
Recurso Eletrônico
Periódico
29
Publicado em 1991
Full text available from East Europe, Central Europe Database: 01/01/2017 to present
Recurso Eletrônico
Periódico
30
31
32
Publicado em 1998
Full text available from Agricultural Science Database: 01/01/1999 to present
Recurso Eletrônico
Periódico
33
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35
Publicado em 1998
Full text available from Agricultural Science Database: 01/01/2003 to 12/31/2004Full text available from Biological Science Database: 01/01/2003 to 12/31/2004
Full text available from Environmental Science Database: 01/01/2003 to 12/31/2004
Full text available from Agricultural Science Database: 01/01/2006 to present
Full text available from Biological Science Database: 01/01/2006 to present
Full text available from Environmental Science Database: 01/01/2006 to present
Recurso Eletrônico
Periódico
36
Publicado em 1994
Full text available from East Europe, Central Europe Database: 01/01/2013 to presentFull text available from Political Science Database: 01/01/2013 to present
Recurso Eletrônico
Periódico
37
Full text available from East Europe, Central Europe Database: 01/01/2006 to present
Full text available from Military Database: 01/01/2006 to present
Full text available from Science Database: 01/01/2006 to present
Recurso Eletrônico
Periódico
38
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