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The Ring Method
Surface Tension. Britannica CD 2000. Encyclopaedia Britannica 1994-2000.
The Ring Method
Committee on Ground Water Recharge in Surface-mined Areas. Surface Coal Mining Effects on Ground Water Recharge. Washington, D.C. National Acadamy Press, 1990
Surface Mining and Water Quality
Sogade J., Vichabian Y., Vandiver A., Reppert P., Coles D., Morgan F. Electromagnetic Cave-to-Surface Mapping System. IEEE Transactions on Geoscience and Remote Sensing, vol. 42, no. 4, 2004, p754.
Remote Sensing
Benfield, F. Kaid; Raimi, Matthew D.; and Chen, Donald D. T. Once There Were Greenfields: How Urban Sprawl Is Undermining America's Environment, Economy, and Social Fabric.1994: Natural Resources Defense Council, Surface Transportiation Policy Project.
Urban Sprawl
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