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  1. 1
    by Walker, Ormiston H.
    Published 2004
    Subjects “...Science Study and teaching (Middle school)...”
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    100 scientific construction projects : science principles, technology, science toys, measuring devices /
  2. 2
    by Walker, Ormiston H.
    Published 1994
    Subjects “...Science Study and teaching (Middle school)...”
    Book
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    Science construction projects : 50 working models.

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