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Frank, R., Chapman, N. & Johnson, R. Survey of farm wells for nutrients and minerals, Ontario, Canada, 1986 and 1987. Bull. Environ. Contam. Toxicol. 47, 146–151 (1991). https://doi.org/10.1007/BF01689466
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DOI: https://doi.org/10.1007/BF01689466