na INLIS000000000002271 0-7923-1774-2 0010-0124001957 631.84 LAD b LADHA, J.K. Biological nitrogen fixation for sustainable agriculture ed. by j.K. Ladha, T. George and B.B. Bohlool Dordrecht Kluwer Academic Publishers 1992 xi, 209 p.; ills. ; 26 cm. AGRICULTURE NITROGEN FIXATION. SUSTAINABILITY VOL. 49. 141/1997