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		No cover image available College Academic Assistence Programs and Practices by SIMPSON, Michele L., coaut Material type: Text; Format: print ; Literary form: Not fiction Publication details: Nueva York, EUA Availability: No items available.
		No cover image available Curriculum integration of Microworlds and portable computers by MCDOUGALL,Anne Material type: Text; Format: print ; Literary form: Not fiction Publication details: Nueva York, EUA Availability: No items available.
		No cover image available Educational environments for research on cognitive development through programming by OAKLEY, John McDOUGALL, Anne Material type: Text; Format: print ; Literary form: Not fiction Publication details: Nueva York, EUA Availability: No items available.
		No cover image available Logo and geometric thinking : concrete-abstract-concrete thinking / Leping Liu, Rhoda Cummings by LIU, Leping CUMMINGS, Rhoda, coaut Publication details: NUEVA YORK, EUA Availability: No items available.
		No cover image available Research on logo : a decade of progress by Clements, Douglas H Sarama, Julie [coaut.] Material type: Article; Format: print Publication details: Nueva York, EUA 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.