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东北三省粮食生产区域变化及影响因素分析
刘时东 陈印军 方琳娜
The Change of Grain Production Regional and Its Influencing Factors in Three Northeast Provinces
中国农学通报 . 2014, (11): 44 -49 .  DOI: 10.11924/j.issn.1000-6850.2013-2139