Northern Shaolin: Twelve Tantui Boxing Series / Chan Kin Man, editor (Chinese - English Edition)

Yih Mei Book Co., 1987. Trade paperback. VG. 

Chan explains this in the Introduction to Tantui on pages 2-3. Here the series of 12 movements is divided into 2 groups, 6 upper-leg movements, and 6 lower movements. These aren't simply ways of kicking, they are sequences of movements each consisting of 10-20 photographs with descriptions in Chinese and English.