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 14. Distributions of well depths for the major aquifer study (MAS), land use study (LUS), and source-water quality assessment (SWQA) networks, and distribution of well depths for the classes of water use, from data collected in 22 study units of the National Water-Quality Assessment program, 1993–2004.

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