This historic diagram, which had been digitally enhanced and colorized, depicted the correct way in which a spring, used as a farm's potable water supply, should be safely configured in order to avoid contamination originating from surrounding structures such a home, barn, or waste piles. Published in 1915, this was one of a series of instructional drawings used by the Minnesota Board of Health to train its state public health workers.
CDC/ Minnesota Department of Health, R.N. Barr Library; Librarians Melissa Rethlefsen and Marie Jones
December 4, 2012
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