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is d eep est a p p r e c ia tio n to P r o fe s s o r A rth u r L. Benton fo r h is in v a lu a b le guidance throughout th e co u rse o f t h i s in v e s t ig a t io n .The w r i t e r i s a ls o g r e a t ly i n debted to Dr. John C. MacQueen, D ir e c to r o f th e Iowa S ta te S e rv ic e s fo r C rip p le d C h ild re n , fo r h is g ra c io u sn e ss in p u ttin g th e f a c i l i t i e s o f h is agency a t th e w r i t e r 's d is p o s a l.The w r i t e r extends h is g r a ti tu d e to h is w ife , S a lly , and c h ild r e n , John David and H o lly , f o r t h e i r a b i l i t y to a b id e by th e r e a l i t y p r i n c i p le th ro u g h o u t th e s e v e ra l months devoted to t h i s s tu d y .F in a lly , a v o te o f thanks to Miss Jo S h rad er fo r h e r .hig h ly com petent work in ty p in g and assem b lin g t h i s m a n u scrip t.T his in v e s t ig a t io n was su p p o rted by a re s e a rc h g ra n t (B-616) from th e N atio n al I n s t i t u t e o f N eu ro lo g ical D isease and B lin d n e ss.
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