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go
to Wilderness Medical Society> and look for: Risk Factors for Coliform Bacteria in Backcountry Lakes and Streams but that may give you only the abstract, so put this: Risk Factors for Coliform Bacteria in Backcountry Lakes and Streams into your search engine, and you should get lots of copies for free or view a summary at the PCTA website or if it has moved, go to http://PCTA.org and Search: Sierra Mountain Water: Is It Safe to Drink?
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