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Fitzner, R.E., Gray, R.H. & Hinds, W.T. Heavy metal concentrations in great blue heron fecal castings in Washington State: A technique for monitoring regional and global trends in environmental contaminants. Bull. Environ. Contam. Toxicol. 55, 398–403 (1995). https://doi.org/10.1007/BF00206678
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DOI: https://doi.org/10.1007/BF00206678