Subject
Yoga books
6 free books about yoga, free to read online. Chapter 1 of any book is free, no account needed.
A Series of Lessons in Raja Yoga
An Introduction to Yoga
The Hindu-Yogi Science of Breath
The Doctrine and Practice of Yoga
Including the Practices and Exercises of Concentration, both Objective and Subjective, and Active and Passive Mentation, an Elucidation of Maya, Guru Worship, and the Worship of the Terrible, also the Mystery of Will-Force