TY  - BOOK
AU  - Hartley, Ruth E.
AU  - Frank, Lawrence K.
TI  - Understanding children's play
U1  - 372.21/HAR 
PY  - 1967///
CY  - New York
PB  - Columbia University press
KW  - Elementary education
N1  - Includes,appendix  bibliographical references & index
ER  -