Granhall, Ulf Sweden Statens naturvetenskapliga forskningsråd (Sweden) text Stockholm] Swedish Natural Science Research Council c1978 monographic 391 p. : ill. ; 25 cm. "Proceedings of an international symposium, sponsored by the Swedish Ministry of Education and the Swedish Natural Science Research Council, Uppsala, Sweden, 20-24 September 1976." Nitrogen-fixing microorganisms Nitrogen-fixing algae Cyanobacteria 589 SWE 1978 C147 Or. 9154602432