Proceedings of the fourth international symposium on nitrogen fixation, current perspectives in nitrogen fixation, held in Canberra, Australia, 1 to 5 December 1980 - New York: Elsevier/North-Holland Biomedical Press, 1981 - x, 534p. ISBN: 0858470853 Subjects--Topical Terms: Agriculture Subjects--Index Terms: Dinitrogen Coordinated Hydrazine Universal Decimal Class. No.: 631.461 / M1