When we were in junior high school, when we talked about the culture of new China, we talked about two most famous representative calligraphers, one was Shen Yimo, and the other was Qigong. What is posted in the book is the calligraphy works of Qigong, that is, Chairman Mao's "Water Tune Song Tou" focuses on Jinggangshan. You can go and have a look. It is clear that I went to junior high school in 1996.
I can only help you so much. I like looking online very much.