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Được phát hành 1991
Full text available from ABI/INFORM Trade & Industry: 09/01/2005 to 07/31/2015Full text available from Career & Technical Education Database: 09/01/2005 to 07/31/2015
Full text available from Earth, Atmospheric & Aquatic Science Database: 09/01/2005 to 07/31/2015
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Full text available from Science Database: 09/01/2005 to 07/31/2015
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5
Full text available from Political Science Database: 01/01/2013 to present
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Full text available from Sociology Database: 01/01/2013 to present
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6
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Được phát hành 1989
Full text available from ABI/INFORM Trade & Industry: 04/11/1994 to 12/19/2011Full text available from Advanced Technologies & Aerospace Database: 04/11/1994 to 12/19/2011
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10
Full text available from Australia & New Zealand Database: 01/01/2008 to present
Full text available from Earth, Atmospheric & Aquatic Science Database: 01/01/2008 to present
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11
12
Full text available from ABI/INFORM Trade & Industry: 01/01/1991 to 06/30/2017
Full text available from Advanced Technologies & Aerospace Database: 01/01/1991 to 06/30/2017
Full text available from Career & Technical Education Database: 01/01/1991 to 06/30/2017
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13
Được phát hành 1981
Full text available from Arts & Humanities Database: 04/01/1998 to 10/31/2018Full text available from PRISMA Database with HAPI Index: 04/01/1998 to 10/31/2018
Full text available from Research Library: 04/01/1998 to 10/31/2018
Full text available from PRISMA Database with HAPI Index: 04/01/1998 to 10/31/2015
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14
15
Full text available from Advanced Technologies & Aerospace Database: 09/01/1997 to 11/30/2018
Full text available from Arts & Humanities Database: 09/01/1997 to 11/30/2018
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Full text available from Career & Technical Education Database: 12/01/1996 to 09/30/2011
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Full text available from Advanced Technologies & Aerospace Database: 08/23/2011 to 08/14/2017
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Full text available from Engineering Database: 08/23/2011 to 08/14/2017
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20
Full text available from Advanced Technologies & Aerospace Database: 01/01/2005 to present
Full text available from Career & Technical Education Database: 01/01/2005 to present
Full text available from Engineering Database: 01/01/2005 to present
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