TY - BOOK ED - Elkan, G. H. ED - Upchurch, R. G. TI - Current issues in symbolic nitrogen fixation : proceedings T2 - Developments in plant and soil science ; no.72 SN - 0792343670 U1 - 581.133 PY - 1997/// CY - Boston PB - Kluwer Academic Publishers KW - Fixation of Nitrogen ER -