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Nelson, A. 2008. Estimated travel time to the nearest city of 5,000 or more people in year 2000. Personal communication of December 8, 2008. Rammankutty, N et al. 2008. Farming the planet: 1. Geographic distribution of global agricultural lands in the year 2000', Global Biogeochemical Cycles, Vol. 22, GB1003, doi:10.1029/2007GB002952. HYPERLINK 'http://www.geog.mcgill.ca/~nramankutty/Datasets/Datasets.html' http://www.geog.mcgill.ca/~nramankutty/Datasets/Datasets.html (Accessed December 4, 2008)