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FIGURE 1—— Age-adjusted colon cancer mortality rates, by county area, and contours of annual mean daily solar irradiance in Langleys (calories/cm²), United States, 1970–1994.

Source. Developed through use of National Cancer Institute and National Oceanic and Atmospheric Administration data (available at http://www3.cancer.gov/atlasplus/charts.html and http://www.noaa.gov).