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Surface Tension. Britannica CD 2000. Encyclopaedia Britannica 1994-2000.
The Ring Method
Harkins, WD & Jordan, HF. A Method for the Determination of Surface and Interfacial Tension form the Maximum Pull on a Ring. The Journal of the American Chemical Society, vol. 52, 1930.
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
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
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
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