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		No cover image available The interactive videodisc system in the zone of proximal development : Academic motivation and learning outcomes in precalculus by Henderson, Ronald W Landesman, Edward M Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.
		No cover image available Visualizing precalculus concepts : interactive representation via videodisc technology by Landesman, edward M Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.

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