Put in the Google Engage in Textbooks application for Android and iPad/apple iphone. It syncs mechanically along with your account and enables you to read on-line or offline where ever you happen to be.- ????? ???? ??????? ?? ???? ??????? ?? ????? ??? ??? ???? ???? ?? ????? ??? ???? ??? ??????? ??? ??? ???? ????? ??????? ????? ?? ????? ??? ?????? ?