1 Geotechnical Engineers Handbook, Robert W. Day, McGraw-Hill, 2000
2 Horizontal Directional Drilling, Good Practices Guidelines, HDD Consortium, May 2001
3 J. D. Hair & Associates, Louis J. Capozzoli & Associates, and Stress Engineering Services (1995). "Installation of Pipelines by Horizontal Directional Drilling, An Engineering Design Guide," prepared for the Offshore and Onshore Design Applications Supervisory Committee of the Pipeline Research Committee.
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