polisetty brothers ku namassulu,
Puranallo science book eppatinundo konali anukuntunnanu, dayachesi aa book ekkada labistundo cheppandi
Bala siva krishna
Sir, thank you for giving best book for free download
Detail explanation in simple Telugu language, thanks Ramakrishna Math for this book in this less price.
good but publice your books in to amazon and other sites