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		No cover image available A summary of research in science education : 1990 by Klopfer, Leopold E. Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.
		No cover image available The ubiquitous quiantities : explorations that inform the design of instruction on the physical properties of matter by KLOPFER, Leopold E \| CHAMPAGNE, Audrey B., coaut \| CHAIKLIN, Seth D., coaut. Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.

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