Geography Reference
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Williams, M. W., Knauf, M., Cory, R., Caine, N., and Liu, F. 2007. Nitrate content and
potential microbial signature of rock glacier outflow, Colorado Front Range. Earth
Surface Processes and Landforms 7: 1032-1047.
Williams, P. J. 1957. Some investigations into solifluction features in Norway. Geograph-
ical Journal 72: 42-58.
Williams, P. J., and Smith, M. W. 1989. The Frozen Earth: Fundamentals of Geocryology.
New York: Cambridge University Press.
Williams, R. B., and Robinson, D. 1991. Frost weathering of rocks in the presence of
salt: A review. Permafrost Periglacial Processes 2: 347-353.
Woodcock, A. H. 1974. Permafrost and climatology of a Hawaii crater. Arctic and Alpine
Research 6: 49-63.
Wu, Q. B., and Zhang, T. J. 2008. Recent permafrost warming on the Qinghai-Tibetan
plateau. Journal of Geophysical Research—Atmospheres 113(D13108): 1-22.
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