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Dive into the evolution of Environmental Impact Assessment sampling in U.S. states from 1972 to 2007. View the data rates visually with color-coded maps showing progressive changes over time.
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Animation of EIA Sampling • State by state display of sampling data • 1972 – 1989: rate per 100 (percent positive) • 1990 – 2007: rate per 10,000 • Each year is divided into three classes, taking the difference of the minimum and maximum values and dividing it by three.