14 



Nebeker, G. T. and L. L. St. Clair. 1980. Enhancement of seed 

 germination and seedling development by cryptogamic soil crusts. 

 Botanical Society of America Miscellaneous Publication Series No. 

 158, p. 81. 



Rollins, R. C. 1984. Studies in the Cruciferae of western North 

 America II. Contributions to the Gray Herbarium 214: 1-18. 



Rychert, R. C. and J. Skujins. 1974. Nitrogen fixation by blue- 

 green algae-lichen crusts in the Great Basin Desert. Soil 

 Science Society Proceedings 38: 768-771. 



Savory, A. 1988. Holistic resource management. Island Press, 

 Washington D.C. 



Savory, A. and S. D. Parsons. 1980. The Savory Grazing Method. 

 Rangelands 2: 234-237. 



Schassberger, L. A. 1988. An update of the report on the 

 conservation status of Arabis fecunda, a candidate threatened 

 species. Unpublished report submitted to the U.S. Fish and 

 Wildlife Service, Office of Endangered Species, Denver, CO. 



Snyder, J. M. and L. H. Wullstein. 1973. The role of desert 

 cryptogams in nitrogen fixation. American Naturalist 90: 257- 

 265. 



St. Clair, L. L. , B. L. Webb, J. R. Johansen and G. T. Nebeker. 

 1984. Cryptogamic soil crusts: enhancement of seedling 

 establishment in disturbed and undisturbed areas. Reclamation 

 and Revegetation Research 3: 129-136. 



U.S. Department of Interior, Fish and Wildlife Service. 1990. 

 Endangered and threatened wildlife and plants; review of plant 

 taxa for listing as endangered or threatened species; notice of 

 review. Federal Register 55 (35): 6184-6229. 



Weaver, T. 1980. Climates of vegetation types of the Northern 

 Rocky Mountains and adjacent plains. American Midland Naturalist 

 103: 392-398. 



Wilkinson, L. 1986. SYSTAT: The system for statistics. SYSTAT 

 Inc., Evanston, IL. 



