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https://www.yearbookchina.com/navisearch-2-0-3-1-beijing-0.html;北京市统计年鉴
https://www.yearbookchina.com/navisearch-2-0-3-1-tianjin-0.html;天津市统计年鉴
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https://www.yearbookchina.com/navisearch-2-0-3-1-liaoning-0.html;辽宁省统计年鉴