Algebraic thinking tools :  supports for modeling situations and solving problems in kids' worlds / 
David McArthur ... [et al.] ; prepared for the National Science Foundation. 
 - California :  Rand Corporation,  1989 
 - v, 10 p. :  ill. ;  28 cm 
 - A Rand note ;  N-2974-NSF .
 - Rand note ;  N-2974-NSF .
<br/><br/><label>ISBN: </label> Hadiah