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Great Lakes Echo (http://greatlakesecho.org/2012/11/08/great-lakes-lawmakers-consider-statewide-bans-on-pavement-sealants/p8230044/)

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P8230044

Published November 4, 2012 at 3264 × 2448 in Great Lakes lawmakers consider statewide bans on pavement sealants
U.S. Geological Survey researchers applying coal-tar sealant for an experiment. Credit: Barbara Mahler, USGS Research Hydrologist

U.S. Geological Survey researchers applying coal-tar sealant for an experiment. Credit: Barbara Mahler, USGS Research Hydrologist

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