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		No cover image available Fragile knowledge of angle in turtle geometry by Simmons, Malcolm Cope, Peter Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.
		No cover image available Working with a round turtle : the development of angle-rotation concepts under restricted feedback conditions by SIMMONS, Malcom COPE, Peter, coaut Material type: Text; Format: print ; Literary form: Not fiction Publication details: Nueva York, EUA Availability: No items available.

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