Nitrogen fixation : vol. 2, Symbiotic associations and cyanobacteria / edited by William E. Newton and William H. Orme-Johnson. Kettering International Symposium on Nitrogen Fixation, (3rd : 1978 : Madison, Wis.) Newton, William E. (William Edward), 1938- ed. Orme-Johnson, William H. ed. Nitrogen-fixing microorganisms. Nitrogen Fixation. QR89.7 .K47 1978 547.04 19 N731 Includes bibliographical references and index. Baltimore : University Park Press, c1980. c1980. 1980 Text v. : eng