GENKI is a highly acclaimed series of integrated resources for learning elementary Japanese through a well-balanced approach to all four language skill areas—speaking, listening, reading, and writing. Used in many Japanese language courses around the world.
All pdf's were converted with OCR, so you can select and copy any text inside.
I also made an app that helps you improve your Japanese vocabulary.
https://play.google.com/store/apps/details?id=com.oscar.vocjapanese