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Keep Earth Clean, Blue & Green
George HenningsDorothy Grant Hennings
其他書名
Environmental Activities for Young People
出版Citation Press, 1976
主題Technology & Engineering / Environmental / General
ISBN05900746019780590074605
URLhttp://books.google.com.hk/books?id=-WwHqAAACAAJ&hl=&source=gbs_api
註釋A source book for elementary and junior high teachers which provides numerous interdisciplinary environmental activities.