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平台:
EBSCOhost Business Source Complete
(Available from 1995/01/17 until 1997/07/22.)
ProQuest Agricultural & Environmental Science Database
(Available from 1998/01/20 until 1999/10/14. Available from 2001/05/01 until 2006/12/18.)
ProQuest SciTech Premium Collection
(Available from 1998/01/20 until 1999/10/14. Available from 2001/05/01 until 2006/12/18.)