Microbial Quality of the Nation’s Ground-Water Resources, 1993–2004

Scientific Investigations Report 2006–5290

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

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Figure - refer to figure caption for alternative text description

Figure 15. Distribution of well depths in the 16 principal aquifers studied by the National Water-Quality Assessment program, 1993–2004.

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