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Tumors in brown bullhead catfish from the Anacostia River,, <br />Washington, D. C.,, are believed to be related to elevated P <br />concentration s (Pi n kn ey and others, 2009i). Ph otog ra ph by A. E. <br />Finney. <br />Skin contact is one way humans can be expois�ed to PAHs. <br />Parking lots andl driveways with coal-tar-based sealcoat, have <br />concentrations of PAHs hundreds to thousands of times higher <br />than those with asphalt-based sealcoia�t or no sealcoat Photograph <br />obtained from Corbis Images, Inc. <br />