丰宁县生态环境存在的问题及对策（孙志永 金花 张小东 武占昆） - 水利科技资讯 - 水资讯网 关键词：丰宁县；生态环境；对策 [gap=652]Key Words: Fengning county, Ecological Environment, countermeasure.
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Fengning Manchu Autonomous County 丰宁满族自治县
Fengning Man Autonomous County 丰宁满族自治县
·2,447,543篇论文数据，部分数据来源于NoteExpress
Bird fossils were for the first time discovered in the bottom of the Jurassic Yixian Formation in the north of Fengning county, Hebei.
河北省丰宁县北部侏罗系义县组底部首次发现鸟类化石。
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