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Sinkholes in Pennsylvania - http://www.dcnr.state.pa.us/topogeo/hazards/es11.pdf
Educational booklet by William E. Kochanov, issued by the Pennsylvania Geological Survey, explains sinkhole formation in carbonate bedrock terrain and problems that can result from human activities in areas of karst topography. |
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Environmental Problems in Karst Lands - http://www.prenhall.com/divisions/esm/app/nebel/html/updates/update13.html
Brief review of the engineering and environmental concerns of occupying karst terrain, including mitigation measures. |
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Karst: The Stealthy Hazard - http://www.geotimes.org/may01/feature2.html
Illustrated article (in Geotimes) discusses flooding, sinkhole collapse, infrastructure damage, and other impacts from development on karst lands in Kentucky. |