Millennial-scale variability during the last glacial in vegetation records from North America
Jiménez-Moreno et al. 2010
This paper is particularly handy in how well it describes rapid changes in climate-sensitive plant species, particularly the difference between elevation changes at higher latitudes and regional differences at lower latitudes. The paper was particularly informative in describing the rates of raid changes between altitude shift regions and regional shift regions.
http://www.sciencedirect.com/science/article/pii/S0277379109004326