References

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  • "The Country leaf and the City Leaf." Discover, Aug. 1992, p.12.
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  • "Plants to Indicate Air Pollution." New Scientist Feb. 10, 1966: 344.
  • Johnson, D.L., D.J. Nowak, V.A. Jouraeva. "Characterizing Individual Particles on Tree Leaves Using Computer Automated Scanning Electron Microscopy." Adv. In Environmental Research 2: 456-466, 1999.
  • Fortmann, R.C. and D.L. Johnson. "Effect of Simulated Rainfall on Removal and In Situ Formation of Particles on Taxus Needles." Environmental Pollution (Series B) 7: 297-316, 1984.
  • Petrides, George A. and Janet Wehr. A Field Guide to Eastern Trees. New York: Houghton Mifflin Co., 1988.
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