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Full text available from Career & Technical Education Database: 04/01/1998 to 12/31/2002
Full text available from Engineering Database: 04/01/1998 to 12/31/2002
Full text available from Military Database: 04/01/1998 to 12/31/2002
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Full text available from Science Database: 12/01/1997 to 05/31/2007
Full text available from Engineering Database: 12/01/1997 to 05/31/2007
Full text available from Environmental Science Database: 12/01/1997 to 05/31/2007
電子
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