Bronx middle school students volunteer their time in Bronx Park in New York

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Bronx middle school students volunteer their time in Bronx Park in New York on Tuesday, April 13, 2010. The students test the water quality of the Bronx River using the Winkler titration method to measure the dissolved oxygen in the water. (© Frances M. Roberts)

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Size: 5120px × 3401px
Location: new york ny usa north america
Photo credit: © Frances Roberts / Alamy / Afripics
License: Licensed
Model Released: No

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