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 13. Relation of the presence or absence of coliphage virus to concentrations of total coliforms for wells in the major aquifer study (MAS) networks and source-water quality assessment (SWQA) networks, and for principal aquifers with coliphage-positive wells.

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