Rieko Nakagawa, author of the long-selling picture book series featuring twin mice "Guri and Gura," has died, the publisher of many of her books said Thursday. She was 89.Children's literature author Nakagawa died of old age at a hospital in Tokyo early Monday morning, according to Fukuinkan Shoten Publishers Inc.Born in 1935 in Sapporo in Japan's northern main island of Hokkaido, Nakagawa began writing while working as a nursery school teacher.She published her first children's book, "No No Nursery School," in 1962, depicting stories of a nursery school boy named Shigeru."Guri and Gura," w…READ FULL ARTICLE