Modern electronic books (e-learning classes for customer use)    "Modern electronic textbook" allows users to download Modern Educational Research Society of electronic textbooks and books published, and save it to a personal collection of shelves, ready online and offline reading.    Features "Modern electronic textbook" program: ‧ offers a variety of books, including the various disciplines of textbooks, story books, and so on. After ‧ user logged in, the program that the user belongs to recog