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3. The Biotechnology of Space Biospheres;Nelson,1990
4. Soil Bed Reactor Work of the Environmental Research Laboratory of the University of Arizona in Support of the Research and Development of Biosphere 2;Frye,1990
5. R. Frye, D. Walsh, T. Berry, B. Stevenson, and L. Leigh, Removal of Contaminant Organic Gases from Air in Closed Systems by Soil Bed Reactors (in review).