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2. Ashley, J. and S.R. Rushforth. 1984. Growth of soil algae on topsoil and processed oil shale from the Uintah Basin, Utah, USA. Reclamation and Revegetation Research 3: 49?63.
3. Belnap, J. 1992. Effects of wet and dry pollutants on the physiology and elemental accumulation of cryptobiotic crusts and selected rock lichens on the Colorado Plateau. Final Report, National Park Service, Washington Air Quality Division, December 1991. NPS/AQ-91, on file at Washington Office of Air Quality, National Park Service, Denver, Colorado.
4. Belnap, J. 1993. Recovery rates of cryptobiotic crusts: Inoculant use and assessment methods. Great Basin Naturalist 53(1): 89?95.
5. General Technical Report;J. Belnap,1994