Arya, S C <br/><br/>
Development of scientific concepts among children:   Based on piagetian tasks 

 - Agra:   National Psychological Corporation,   1993 
 - 159p. 
 - Bhargava research monograph series no. 35 .
<br/><br/><label>ISBN: </label>81-85316-38-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Scientific concepts
<br/><br/><label>Subjects--Index Terms: </label>Conservation of mass 
<br/><br/><label>Universal Decimal Class. No.: </label>159.922.72:165.191  / N3