Hyde, Doris Matilda. <br/><br/>
An investigation of Piaget's theories of the development of the concept of numbers  [microform]. 

 - London :  University of London Library. 
<br/><br/>Thesis (Ph.D.)--University of London, 1959. 
<br/><br/><br/>Microfilm. London : University of London Library. 1 microfilm reel : positive ; 35 mm. <br/>Microfilm. London : University of London Library. 1 microfilm reel : positive ; 35 mm. <br/>Microfilm. London : University of London Library. 1 microfilm reel : positive ; 35 mm. <br/>Microfilm. London : University of London Library. 1 microfilm reel : positive ; 35 mm. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Piaget, Jean, 1896- Piaget, Jean, 1896- 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number concept.