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 10. Concentrations of total coliform and Escherichia coli by principal aquifer lithology in samples collected in 22 study units of the National Water-Quality Assessment program, 1993–2004.

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