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  1. 1
    Published 1971
    Chicago, Rand McNally [c1971]
    103 p. illus. 24 x 24 cm.
  2. 2
    Published 1969
    [Berkeley, Calif., Science Curriculum Improvement Study, Lawrence Hall of Science, University of California, c1969]
    v. illus. (part col.) 28 cm.

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