TY  - BOOK
AU  -  Clark,John R.
TI  -  Growth in arthmetic, grade seven / 
U1  -  372.72 CLA 
PY  - 1952///
CY  -  Yonkers  : 
PB  -  World Book Company, 
KW  -  Arithmetic
KW  -  Study and Teaching  (Primary)
KW  -  Mothematical Ability
ER  -