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平台:
ProQuest Agricultural & Environmental Science Database
(Available from 2001/09/01 until 2018/07/31.)
ProQuest SciTech Premium Collection
(Available from 2001/09/01 until 2018/07/31.)
SAGE Backfile
(Available from 1945/02/01 volume: 15 issue: 2 until 1998/12/31 volume: 68 issue: 12.)