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Nonsymbiotic nitrogen-fixing micro-organisms in forest and tundra soils

by Jurgensen, M. F., Davey, C. B.
Published in Plant and Soil (1971)

Nitrogen-fixing blue-green algae in acid forest and nursery soils

by Jurgensen, M. F., Davey, C. B.
Published in Canadian Journal of Microbiology (1968)