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USGS Water-Quality Monthly Statistics for Illinois

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Choose Site Selection Criteria
Choose from the following criteria to constrain the number of sites selected.   If no additional site-selection criteria are chosen and no additional specifications are defined on the following page then output will be for all 110 sites that have monthly statistics.

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          Site
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          Data
   -- Attribute * --

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* Selection of more than one data attribute will include all samples that meet all conditions selected.