000
00244nam a2200097Ia 4500
008
250530s9999 xx 000 0 und d
100
_a
Subha Rao,et.al
245
0
_a
Biological nitrogen fixation
260
_a
New Delhi
_b
ICAR
_c
1993
942
_c
BK
999
_c
293457
_d
293457