Paper towel testing : teacher's guide, grades 5-8
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Paper towel testing : teacher's guide, grades 5-8
（GEMS guides, . Teacher's guides）
Great Explorations in Math and Science (GEMS), Lawrence Hall of Science, University of California at Berkeley, 2003, c1987
Repr. with revisions, 2003
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"Skills, designing controlled experiments, ..., concepts, consumer science, ... ,themes, systems and interactions, ..., time, four 30- to 45-minute sessions ..."
