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United States
Department of Agriculture
Agricultural Research Service

Heat stress forecasts produced as a partnership of USDA-ARS with National Oceanic & Atmospheric Administration (NOAA) National Weather Service

GRASS Development Team, 2010. Geographic Resources Analysis Support System (GRASS) Software, Version 6.4.0. Open Source Geospatial Foundation.
Neteler, Markus and Helena Mitasova. Open Source GIS: A GRASS GIS Approach. Third Edition. New York: Springer, 2008.
ImageMagick Studio LLC, P.O. Box 40, Landenberg, PA 19350, USA.