This year marks the 81st anniversary of the establishment of the Beijing Palace Museum. The Palace Museum library was built on the basis of the Ming and Qing dynasties' court collections. By 1930, there were more than 500,000 books. Rare books moved south during the War of Resistance Against Japan. The Taipei Palace Museum. Later, the Beijing Palace Museum continued to count and sort out the Qing Dynasty relics and rebuild the rare book library. Now there are more than 190,000 rare books, and there are more than 200,000 (block) editions of Wuying Palace and copper plates. This passage mainly introduces? ['Palace historical and cultural relics.', 'Heritage books from the Palace Museum.', 'Qing Dynasty Books from the Palace Museum.', 'Historical Archives of the Palace Museum.']