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Kogan, Felix. 2001. Operational space technology for global vegetation assessment. Bulletin of the American Meteorological Society 82, no. 9 (Sept): 1949-64.
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Lawrimore, Jay, Richard R. HeimJr., Mark Svoboda, Val Swail, and Phil J. Englehart. 2002. Beginning a new era of drought monitoring across North America. Bulletin of the American Meteorological Society 83, no. 8 (Aug): 1191–1192.
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