This font is called "Wei Bei", and Wei Bei refers to the calligraphy works of inscriptions in the Northern and Southern Dynasties (preferably the Northern Wei Dynasty), which is a kind of regular script. The famous Wei Bei copybooks include Zheng Wengong Monument, Zhang Menglong Monument, Gao Zhen Monument, Yuan Huai Epitaph, Zhang Xuan Epitaph, etc. You can buy them in physical bookstores or online bookstores.
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