Chen Ruhua’s “Orthodox Sanyuan Xuankong Big Hexagram Prompting Yin and Yang Erzhai Some Artifacts”

Chen Ruhua’s “Straightforward Explanation of the Secrets of the Xuankong Dagua Tianyubao Sutra” page 87

Chen Ruhua’s “Orthodox Sanyuan Yinbu Maofa Baojian”

Manuscript of Mahan Ruhuang Extremely Easy to Count