Classic, concise, clear, accessible yoga book ASANA PRANAYAMA MUDRA BANDHA by Swami Satyananda Saraswati is available HERE although not in its latest version.
Imo, this manual is particularly interesting when new to yoga and/or or looking for some easy body routines that you can start practicing alone. The Beginners group is good indeed, with different series of basic exercises to help prevent or help alleviate disorders caused by overexertion and stillness-stasis combined (as in a lot of computer / office work). Check out the Exercises for the eyes !
(Remember to first read the advice and precautions in the introduction)