Yang Gong has several classics. What are they?

Yang Gong has written nine books: Doubt Dragon Sutra, Shake Dragon Sutra, Picture Clip, Quadratic Method, Setting a Cone, Painting Sand, Fetal Abdominal Sutra, Looking at Dragon Sutra, and Inverted Staff Method. According to Shu Shu Shu series (IX), there are five books: Yilong Jing, Hanlong Jing, Burying with an Inverted Staff, Qingnangao Yu and Tian Yu Jing. There are many records about Yang Gong's geomantic theory works in other geomantic books. According to textual research, there are at least three most reliable works by Yang Junsong: Qingnangao Yu, Tianyu Jing and Yuchi Jing.