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The Organized Ungraded Teacher

出版	B.C. Teachers' Federation, Lesson Aids Service, 1989
URL	http://books.google.com.hk/books?id=3r6GuAAACAAJ&hl=&source=gbs_api

註釋Grade level: 1, 2, 3, 4, 5, 6, 7, e, p, i, n, t.