四庫全書
Rare books in the National Palace Museum range from the Song (960–1279) and Yuan (1271–1368) dynasties to the Ming (1368–1644) and Qing (1644–1912) dynasties, amounting to over 200,000 volumes. "Yongle Encyclopedia" and "Siku Quanshu" ("Complete Library of the Four Treasuries") are among the examples.