TY  - BOOK
AU  - Piaget,Jean
AU  - Inhelder,Barbel
AU  - Szeminska,Alina
TI  - The child's conception of geometry / 
U1  - 155.413 
PY  - 1960///
CY  - London : 
PB  - Routlegde & Kegan Paul, 
KW  - Geometry concept
KW  - Child study
N1  -  Includes bibliographical references
ER  -