Determination for the modal age level for grades seven and nine of the principle: gases, liquids, and solids expand when heated and contract when cooled.

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Date Issued
1952
Author
Gibson, James Randolph
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https://hdl.handle.net/2144/10653
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Thesis (Ed.M.)--Boston University
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Based on investigation of the BU Libraries' staff, this work is free of known copyright restrictions.
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