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• 5.0 LITERATURE CITED <br />Olson, 7.5. 1958. Rates of succession and soil changes on southern Lake Michigan sand <br />dunes. Bot. C:az. 119: 125-170 <br />Oosting, H.J. 1942. An ecological analysis of the plant communities of Piedmont, North <br />Carolina. Amer. Midl. Nat. 28: 1-126 <br />Rickliefs, R.E. 1973. Ecology. Chiron Press.861 p. <br />Savage, M. S. 2000. Reference Area Reality Check. Proc. of the 2000 Billings Land <br />Reclamation Symposium. <br />Savage and Savage, Inc. 1994. 1994 Vegetation Monitoring: Coors Energy Company, <br />Keenesburg Mine, Keenesburg, Colorado. <br />Savage and Savage, Inc. 1995. 1995 Vegetation Monitoring: Coors Energy Company, <br />Keenesburg Mine, Keenesburg, Colorado. <br />Savage and Savage, Inc. 1996. 1996 Quantitative Vegetation Study, Phase II Bond <br />Release, Coors Energy Company, Keenesburg Mine, Keenesburg, Colorado. <br />• Savage and Savage, LZC. 1997. 1997 Vegetation Monitoring: Coors Energy Company, <br />Keenesburg Mine, Keenesburg, Colorado. <br />Savage and Savage, Inc. 1998. I998 Vegetation Monitoring: Coors Energy Company, <br />Keenesburg Mine, Keenesburg, Colorado. <br />Savage and Savage, Inc. 1999. 1999 Vegetation Monitoring: Coors Energy Company, <br />Keenesburg Mine, Keenesburg, Colorado. <br />Savage and Savage, Inc. 2000. 2000 Vegetation Monitoring: Coors Energy Company, <br />Keenesburg Nfine, Keenesburg, Colorado. <br />Savage and Savage, Inc. 2001.2001 Vegetation Monitoring: Coors Energy Company, <br />Keenesburg Mine, Keenesburg, Colorado. <br />Shantz, H.L. 1917. Plant succession on abandoned roads in eastern Colorado. J. Eco[. 5: <br />19-42 <br />• <br />-17- <br />