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		No cover image available The external validity of age-versus IQ-discrepancy definitions of reading disability : lessons from a twin study / [et al.] by Pennington, Bruce F Gilger, Jeffrey W Olson, Richard K Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.
		No cover image available The nonword reading deficit in developmental dyslexia : a review by Rack, John P Snowling, Margaret J Olson, Richard K Material type: Text; Format: print ; Literary form: Not fiction Availability: No items available.

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