Cloud, P. E., Morrison, K., and Lo, S. O., 1977, New late pre-Phanerozoic and earliest Phanerozoic (?) microbiotas from Eastern Siberia: Geological Society of America, Abstracts with Programs, v. 9, no. 12.

Doeksen, J., and van der Drift, J., 1963, Soil organisms: Amsterdam, North- Holland, 453 p.

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