Elementary Science Instruction: Examining a Virtual Environment for Evidence of Learning, Engagement, and 21st Century Competencies
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2005 ◽
Vol 42
(3)
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pp. 411-438
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2008 ◽
Vol 20
(4)
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pp. 1-14
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1994 ◽
Vol 31
(4)
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pp. 363-380
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