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平台:
EBSCOhost Business Source Complete
(Available from 1965/02/01.)
EBSCOhost Environment Complete
(Available from 1965/02/01.)
EBSCOhost OmniFile Full Text Select
(Available from 1995/02/01 until 2006/02/28.)
JSTOR Arts and Sciences VII
(Available from 1948/02/01 volume: 24 issue: 1. Most recent 6 year(s) not available.)
Project MUSE Archives
(Available from 1987/11/01 volume: 63 issue: 4 until 1998/11/30 volume: 74 issue: 4.)
ProQuest Agricultural & Environmental Science Database
(Available from 1987/11/01 volume: 63 issue: 4 until 1998/11/30 volume: 74 issue: 4.)
ProQuest SciTech Premium Collection
(Available from 2008 volume: 84 issue: 1 until 2013 volume: 89 issue: 4.)