Recommended Books
Yoga and Kriya
1000 pages - including some of the kriyas
Dharana Darshan
practises for pratyahara and dharana
Advaita - The Book of One
book - advaita and vedanta
Kundalini and Tantra
describes kundalini and kriya
Yoga Sutras of Patanjali
4 Chapters on Freedom: Yoga Sutras of Patanjali
Asanas and Mudras
very good description about asanas and mudras
Yoga Companion
good pictures and explanation of asanas
Anatomy
anatomy, good pictures and explanations of asanas
Tattva Bodha
famous tattva bodha
I am That