TY  - BOOK
AU  - Balusu Veena Kumari
AU  - Rao, Digumarti Bhaskara
TI  - Operation blackboard
SN  - 9788131304815
U1  - 372.954 
PY  - 2009///
CY  - New Delhi 
PB  - APH Publishing Corp.
KW  - Education, Primary
KW  - India
KW  - Educational planning
N1  - Includes index
ER  -