| U.S. Department of Agriculture National Agricultural Statistics Service Research and Development Division |
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| http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/AVHRR | Full Description of AVHRR sensor |
| http://www.umac.org/ | Upper Midwest Airspace Consortium |
| http://www.kars.ku.edu/ | Kansas Applied Remote Sensing Program |
| http://rangeview.arizona.edu/ | GeoSpatial Tools for Natural Resource Management |
| http://www.ssec.wisc.edu/data/ | Univ. of Wisconsin-Madison, Space Science and Engineering Center |
| http://cnrit.tamu.edu/cgrm/ | Texas A&M University Center for Grazinglands and Range Management |
| http://www26.statcan.ca/ccap-peec/overview-apercu-eng.jsp | Statistics Canada - Crop Condition Assessment Program |
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| http://pekko.geog.umd.edu/usda/beta/ | USDA/FAS Worldwide MODIS GLAM Database |
| http://www.pecad.fas.usda.gov/cropexplorer/modis_summary/ | USDA/FAS MODIS Crop Explorer |
| http://rapidfire.sci.gsfc.nasa.gov/ | MODIS Rapid Response System |
| http://modis.gsfc.nasa.gov/ | Modis Info at NASA Goddard Space Flight Center |
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| http://www.drought.gov/portal/server.pt | National Integrated Drought Information System |
| http://gisdata.usgs.net/website/Drought_Monitoring | USGS Drought Monitoring - VegDRI |
| http://drought.unl.edu/ | National Drought Mitigation Center |
| http://www.ncdc.noaa.gov/oa/ncdc.html | National Climactic Data Center |
| http://www.rcc-acis.org/ | Applied Climactic Information System |