Which calligraphy works are called Sanxi Tie Bao?

The 37 treasure posts refer to Sunshine Post, Mid-Autumn Post and Yuan Bo Post in Fast Snow respectively. Xue Qing Tie is a calligraphy work by Wang Xizhi, a famous calligrapher in Jin Dynasty. It is written on paper in running script and ink. Vertical 23 cm, horizontal

14.8cm, 4 lines, 28 words. Mid-Autumn Post is a book written by Wang Xianzhi in the Eastern Jin Dynasty. It is 27 cm long and 1 1.9 cm wide. Yuan Bo Post is a letter written by Wang Xun in the Eastern Jin Dynasty. It is a paper book, running script, with 5 lines of ***47 characters, with a length of 25. 1 cm and a width of 17.2 cm.

1746, Emperor Qianlong of the Qing Dynasty got Yuan Bo's tie and hid it in hall of mental cultivation with Snow Clear and Mid-Autumn Festival Tie. Together, it is called "Sanxi Baotie" and inscribed as "Sanxi Hall". Since then, Sanxi Baotie has enjoyed a world-renowned reputation and has been regarded as a standard by later scholars.

Saint Xi Tie Bao