If you are new to yoga, you may begin with
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Asana, Pranayama and Mudra of Bihar School of Yoga authored by Swami Satyananda Saraswati.
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Light on Yoga by B.K.S. Iyengar]
You can look for it at www.bookscaterer.com
However, it would be better if you could better learn the basics of yoga from some qualified yoga instructor.