Text ( visual ) : unmediated The green frontier / by Wheeler McMillen ; a ladder edition at the 3,000-word level adapted by Jean B. Wilson ; edited with notes by Akihiro Kitagawa. -- Tokyo : Eihōsha , 1975. -- 79 p. ; 19 cm. -- (BB12308547) ; https://ci.nii.ac.jp/ncid/BB12308547 Other Title(s): 緑のサイエンス. -- Author Heading(s): McMillen, Wheeler ; Wilson Jean B. ; 北川, 彰宏

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