TY - BOOK AU - Stewart,W.D.P. ED - International Biological Programme TI - Nitrogen fixation by free-living micro-organisms SN - 0521207088 : U1 - 589.7 PY - 1975/// CY - Cambridge, Eng. PB - The University Press KW - Nitrogen KW - Fixation KW - Congresses KW - Nitrogen-fixing microorganisms N1 - "Papers presented at an IBP synthesis meeting on nitrogen fixation held in Edinburgh in September 1973, together with contributions submitted by other[s]"; Includes bibliographies and index ER -