1‎.‎ Tropical Stress Ecology of Rhizobia‎,‎ Root Nodulation and Legume Fixation A‎.‎ R‎.‎ J‎.‎ Eaglesham and A‎.‎ Ayanaba‎;‎ 2‎.‎ Interaction of Nitrogen‎-Fixing Microorganisms with Other Soil Microorganisms N‎.‎ S‎.‎ Subba Rao‎;‎ 3‎.‎ Attachment of Nitrogen‎-Fixing Bacteria to Roots of Host Plants F‎.‎ B‎.‎ Dazzo and G‎.‎ L‎.‎ Truchet‎;‎ 4‎.‎ Stem Nodules N‎.‎ S‎.‎ Subba Rao and M‎.‎ Yatazawa‎;‎ 5‎.‎ Oxygen Control Mechanisms in Nitrogen‎-Fixing Systems B‎.‎ D‎.‎ Shaw‎;‎ 6‎.‎ Plasmids Governing Symbiotic Nitrogen Fixation A‎.‎ Kondorosi‎,‎ G‎.‎ B‎.‎ Kiss and I‎.‎ Dusha‎;‎ 7‎.‎ Frankia and its Symbiosis in Non‎-legume ‎(‎Actinorhizal‎)‎ Root Nodules C‎.‎ T‎.‎ Wheeler‎;‎ 8‎.‎ Nitrogen Fixation by Lichens J‎.‎ W‎.‎ Millbank‎;‎ 9‎.‎ Biological Nitrogen Fixation in Sugar Cane A‎.‎ P‎.‎ Ruschel and P‎.‎ B‎.‎ Dose‎;‎ 10‎.‎ Nitrogen Fixation in Wetland Rice Field I‎.‎ Watanabe and P‎.‎ A‎.‎ Roger‎;‎ 11‎.‎ Nitrogen Fixation Associated with Grasses and Cereals R‎.‎ M‎.‎ Boddey and J‎.‎ Dijbereiner‎;‎ 12‎.‎ Azotobacter and Azospirillum Genetics and Molecular Biology C‎.‎ Elmerich‎.‎