Microbial Quality of the Nation’s Ground-Water Resources, 1993

Scientific Investigations Report 2006–5290

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5290

Figure - refer to figure caption for alternative text description

Figure 2. Numbers of test results for fecal-indicator microorganisms by each analytical method for environmental and quality-control samples collected from wells in 22 study units of the National Water-Quality Assessment program, 1993–2004.

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