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平台:
ProQuest Agricultural & Environmental Science Database
(Available from 1998/01/01 until 1999/06/30. Available from 2001/03/01 until 2001/11/30. Available from 2001/03/02 until 1999/07/31. Available from 2002/05/01 until 2012/03/31.)
ProQuest SciTech Premium Collection
(Available from 1998/01/01 until 1999/06/30. Available from 2001/03/01 until 2001/11/30. Available from 2001/03/02 until 1999/07/31. Available from 2002/05/01 until 2012/03/31.)