Batch eight-character important classics

Representative examples are: Yuan Hai Zi Ping by Xu Zisheng, Liu Ji's Notes on the Field and Wood in Ming Dynasty by Song Dynasty, San Tong Ming Hui by Wan Minying in Ming Dynasty, Zhang Nan's The Original Works of Shenfeng Tongkao Numerology, Zi Ping Zhen Quan by Shen Xiaozhan in Qing Dynasty, The Covenant of Numerology by Chen Su 'an and The Origin of Numerology in Modern Yuan Shushan.