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Bibliography - Continued. <br />Robertson, D. R., J. L. Nielsen, and N. H. Bave 1966 Vegetation and <br />Soils of Alkali Sagebrush and Adjacent Big Sagebrush Ranges in <br />North Park, Colorado, Journal of Range Management 19:17-20. <br />Rocky Mountain Association of Geologists 1957 Guidebook to the Geology <br />of North and Middle Parks, Colorado. <br />Rogers, G. E. 1964 Sage Grouse Investigations in Colorado, Colorado <br />Game, Fish and Parks, Department Technical Bulletin I6, 132 p. <br />Safaya, N. M. and M. K. Wali 1979 Growth and Nutrient Relations of a <br />Grass-Legume Mixture on Sodic Coal Mine Spoil as Affected by Some <br />Amendments, Soil Science Society of America Journal Vol. 43(4): <br />747-753. <br />Sandoval, F. M. and J. R. Power 1978 Laboratory Methods Recommended for <br />Chemical Analysis of Mined-Land Spoils and Overburden in Western <br />United States. USDA Agriculture Handbook No. 535, 31 p. <br />i Schoenberg, T. J. 1979 Potential Impact of Strip Mining on Sage Grouse, <br />North Park, Colorado, Colorado Division of Wildlife, Progress <br />Reports, Contract No. YA-512-CT9-35 for April, 1979, July 1979 and <br />October 1979. <br />Schroeder L., E. Patten and B. Wilson 1979(a) Waterfowl Production on <br />the Arapaho National Wildlife Refuge, U. S. Fish and Wildlife <br />Service Colorado-Utah Area, 30 p. <br />Schroeder, L., E. Patten and B. Wilson 1979 (b) Waterfowl Production or <br />the Arapaho National Wildlife Refuge, Annual Progress Report -1979, <br />U. S. Fish and Wildlife Service, Colorado-Utah Area, 15p. <br />Schuman, G. E. and J. F. Power 1980 Plant Grow[h as Affected by Topsoil <br />Depth and Quality on Mined Lands, pp. 6-1 to 6-9 in Adequate Recla- <br />mation of Mined Lands? - A Symposium. <br />• <br />