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- [29] NOTE ON ESTIMATION OF AZOTOBACTER DENSITIES BY MEMBRANE-FILTER TECHNIQUE JOURNAL OF APPLIED BACTERIOLOGY, 1976, 41 (02): : 311 - &
- [30] THE USE OF MEMBRANE-FILTER RIBBONS IN A CONTINUOUS SPOT SAMPLER AIR AND WATER POLLUTION, 1965, 9 (1-2): : 23 - 25