TY  - BOOK
AU  - NCERT
TI  - Development of instructional material in environmental biology for secondary and higher secondary schools of Eastern India ,phase - 1( 23-28 th Sept., 1991 ) : A report
U1  - 574.07 DEV (N-R) 
PY  - 1991///
CY  - Bhubaneswar
PB  - NCERT,RlE
KW  - Biology - study and teaching
ER  -