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 1. Study units of the National Water-Quality Assessment program in which microbiological samples were collected from wells, 1993–2004. (See table 2 for explanation of study-unit name abbreviations.)

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