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![Nitrogen-Fixing Systems: The Biology of Frankla and Actinorhizal Plants. Christa R. Schwintzer and John D. Tjepkema, Eds. Academic Press, San Diego, CA, 1990. xviii, 408 pp., illus., $95. | Science Nitrogen-Fixing Systems: The Biology of Frankla and Actinorhizal Plants. Christa R. Schwintzer and John D. Tjepkema, Eds. Academic Press, San Diego, CA, 1990. xviii, 408 pp., illus., $95. | Science](https://www.science.org/cms/10.1126/science.253.5016.215.a/asset/9428f8a5-feda-4d10-8ac1-98633d713717/assets/science.253.5016.215.a.fp.png)
Nitrogen-Fixing Systems: The Biology of Frankla and Actinorhizal Plants. Christa R. Schwintzer and John D. Tjepkema, Eds. Academic Press, San Diego, CA, 1990. xviii, 408 pp., illus., $95. | Science
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