此事難知
Subtitle: 2 juan
By: Wang Haogu zhuan
Publisher: Ren min wei sheng chu ban she
Published: 1956
Place of publication: Beijing
Language: chi
Number of pages: 52
Subjects: Chinese Medicine; Early works to 1800
Other titles: Ci shi nan zhi
Notes: Ying yin Qing Guangxu 33 nian [1907] Yi tong zheng mai quan shu.