TY  - BOOK
AU  - Kumari, Balusu Veena
AU  - Rao, Digumarti Bhaskara
TI  - Operation blackboard
SN  - 9788131304815
U1  - 372.95484 BAL 
PY  - 2009///
CY  - New Delhi
PB  - A. P. H. Pub. Corp
KW  - Elementary Education
N1  - Includes index
ER  -