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  1. ... to the newly created United States Geological Survey in 1879, where it has ... Topographic maps have multiple uses in the present...

    3 Answers · Education & Reference · 06/11/2007

  2. ... Hypoxia Watch (includes map of dead zone) http://ecowatch.ncddc.noaa.gov/hypoxia Dead zone (ecology) http://en. wikipedia .org/wiki/Dead_zone_(ecology) USGS Publications...

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