September Sea Ice Extent:
Fetterer, F., K. Knowles, W. Meier, and M. Savoie. 2002, updated daily. Sea Ice Index. Boulder, Colorado USA: National Snow and Ice Data Center. http://dx.doi.org/10.7265/N5QJ7F7W.
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Permafrost Map:
Jorgenson, M.T., Yoshikawa, K., Kanevskiy, M., Shur, Y.L., Romanovsky, V., Marchenko, S., Grosse, G., Brown, J., Jones, B., 2008. Permafrost characteristics of Alaska. In: Kane, D., Hinkel, K. (Eds.), Proceedings of the Ninth International Conference on Permafrost. University of Alaska, Fairbanks, AK, pp. 121e122.
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FUDS:
Formerly Used Defense Sites Database (http://geoplatform.usace.army.mil/home/item.html?id=4e3e120ef42947f18b55b33e49e0a90a)
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Topography:
Danielson, J.J., and Gesch, D.B., 2011, Global multi-resolution terrain elevation data 2010 (GMTED2010): U.S. Geological Survey Open-File Report 2011-1073, 26 p.
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