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Holtz, Robert D., Kovacs, William D., Sheahan, Thomas C.. (2011). An Introduction to Geotechnical Engineering (2). Upper Saddle River, NJ: Pearson.

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Holtz, Robert D., Kovacs, William D., Sheahan, Thomas C.. An Introduction to Geotechnical Engineering. 2 Upper Saddle River, NJ: Pearson, 2011. Text.

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Holtz, Robert D., Kovacs, William D., Sheahan, Thomas C.. An Introduction to Geotechnical Engineering. 2 Upper Saddle River, NJ: Pearson, 2011. Text.

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Holtz, Robert D., Kovacs, William D., Sheahan, Thomas C.. An Introduction to Geotechnical Engineering. 2 Upper Saddle River, NJ: Pearson, 2011. Print.