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https://water.usgs.gov/owq/microbial.html USGS Water-Quality Information: Microbial source-tracking and detection techniques USGS Water-Quality Information - Microbial source-tracking and detection techniques; U.S. Geological Survey Office of Water Quality water quality information microbial source tracking usgs detection techniques https://pmc.ncbi.nlm.nih.gov/articles/PMC1855604/ Performance, Design, and Analysis in Microbial Source Tracking Studies - PMC design and analysis microbial source tracking performance studies pmc https://apps.ecology.wa.gov/publications/SummaryPages/1103038.html Review and Critique of Current Microbial Source Tracking (MST) Techniques microbial source tracking review critique current mst