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http://www.nrcs.usda.gov/feature/backyard/wildhab.html

http://www.epa.gov/osw/wycd/catbook/index.htm

http://airnow.gov/

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http://www.bbc.co.uk/schools/ks2bitesize/maths/data/mode_median_mean_range/play.shtml

http://www.bbc.co.uk/schools/ks2bitesize/maths/data/mode_median_mean_range/play.shtml

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