TY  - BOOK
AU  - Kumari, B. V.
AU  - Digumarti, Bhaskar Rao
TI  - Operation blackboard
SN  - 81-7024-711-X
U1  - 372 B189O 
PY  - 1996///
CY  - New Delhi
PB  - : A P H publishers Corporation, 
KW  - Basic education - India
KW  - | Primary education - India
KW  - | Education promotion - India
ER  -