Narayana Rao, S. <br/><br/>
Experimental investigation of children's concepts of mass, weight and volume 

 -  ICSSR, New Delhi  1974 
 - 44p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CONSERVATION OF SUBSTANCE (PSYCHOLOGY)<br/>AGE AND INTELLIGENCE<br/>COGNITION IN CHILDREN
<br/><br/><label>Dewey Class. No.: </label>RN.0005