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Spanish National Library has its once-a-year public open day in Madrid

2018-04-16 09:54:10 (Beijing Time)         news.xinhuanet.com

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Visitors listen to the guide's introduction in the Spanish National Library in Madrid, Spain, on April 15, 2018. The Spanish National Library had its once-a-year public open day on Sunday, which allowed the public to discover its secrets by visiting various parts of the library. (Xinhua/Guo Qiuda)