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Book 1 (Lessons 1-12) is a two book introductory series for beginners. Each volume consists of two sections: "Dialogue and Grammar" and "Reading and Writing." Genki 1 was authored by Eri Banno, Yutaka Ohno, Yoko Sakane, Chikako Shinagawa and published by The Japan Times(1999). It is available for purchase here.