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21
Published 1999
Full text available from Social Science Database: 01/01/2017 to present
Electronic
Journal
22
Published 1989
Full text available from Library Science Database: 01/01/2017 to present
Electronic
Serial
23
24
25
26
27
28
29
30
31
Full text available from Engineering Database: 07/01/2001 to 12/31/2010
Full text available from Agricultural Science Database: 01/01/2012 to 07/31/2014
Full text available from Engineering Database: 01/01/2012 to 07/31/2014
Electronic
Journal
32
33
34
Published 1998
Full text available from Agricultural Science Database: 01/01/2007 to 07/31/2012
Electronic
Journal
35
36
37
38
39
40