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Flegal, A.R., C. Gallon, S. Hibdon, Z.E. Kuspa, and L.F. Laporte. Declining but Persistent Atmospheric Contamination in Central California from the Resuspension of Historic Leaded Gasoline Emissions As Recorded in the Lace Lichen (Ramalina menziesii Taylor) from 1892 to 2006. Environmental Science and Technology 44: 5613-5618.


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