John’s book is a great text on Ashtanga Yoga and the primary series. Following introductory material it has a clear presentation of the asana of the primary series, with step-by-step photographs and the vinyasa count. There’s no fluff and has a real practical focus.
By John Scott
Ashtanga Yoga is a science and a practice that has evolved over a period of thousands of years to deal with moral, physical, mental/emotional, and spiritual development.