1. Feedback-Driven Response to Multidecadal Climatic Variability at an Alpine Treeline
2. T. R. Allen, and S. J. Walsh .1996 .Spatial and compositional pattern of alpine treeline, Glacier National Park, Montana., Photogrammetric Engineering and Remote Sensing, 62 :1261 –1268 .
3. W. L. Baker, J. J. Honaker, and P. J. Weisberg .1995 .Using aerial photography and GIS to map the forest-tundra ecotone in Rocky Mountain National Park, Colorado, for global change research., Photogrammetric Engineering and Remote Sensing, 61 :313 –320 .
4. Rates of Tree-Island Migration, Colorado Rocky Mountains, USA