P. J. Carpenter, I. C. Higuera-Diaz, M. D. Thompson, S. Atre and W. Mandell, “Accuracy of Seismic Refraction Tomography Codes at Karst Sites, Geophysical Site Characterization: Seeing beneath the Surface,” Proceedings of a Symposium on the Application of Geophysics to Engineering and Environmental Problems, San Antonio, 6-10 April 2003, pp. 832-840.
 B. J. Cramer and D. R. Hiltunen, “Investigation of Bridge Foundation Sites in Karst Terrane via Seismic Refraction Tomography,” 83rd Annual Meeting Compendium of Papers CD-ROM, Transportation Research Board, Washington DC, 11-15 January 2004.
 A. A. Bery and R. Saad, “Correlation of Seismic P-Wave Velocities with Engineering Parameters (N Value and Rock Quality) for Tropical Environmental Study,” International Journal of Geosciences, Vol. 3, No. 4, 2012, pp. 749-757. doi:10.4236/ijg.2012.34075
 D. R. Hiltunen and B. J. Cramer, “Geophysical Characterization of Bridge Foundation Sites in Karst Terrane,” 85th Annual Meeting Compendium of Papers CD-ROM, Transpotation Research Board, Washington DC, 22-26 January 2006.
 J. R. Sheehan, W. E. Doll and W. A. Mandell, “An Evaluation of Methods and Available Software for Seismic Refraction Tomography Analysis,” Journal of Environmental and Engineering Geophysics, Vol. 10, No. 1, 2005, pp. 21-34. doi:10.2113/JEEG10.1.21
 A. A. Bery and R. Saad, “Clayey Sand Soil’s Behaviour Analysis and Imaging Subsurface Structure via Engineering Characterizations and Integrated Geophysical Tomography Modelling Methods,” International Journal of Geosciences, Vol. 3, No. 1, 2012, pp. 93-104. doi:10.4236/ijg.2012.31011
 B. B. Redpath, “Seismic Refraction Exploration for Engineering Site Investigations,” Technical Report E-73-4, US Army Engineer Waterways Experiment Station Explosive Excavation Research Laboratory, Livermore, 1973.
 M. L. Rucker, “Applying the Seismic Refraction Technique to Exploration for Transportation Facilities,” Geophysics 2000 Conference Proceedings, Missouri Department of Transportation, St. Louis, 2000.
 S. K. Pullammanappallil and J. N. Louie, “A Generalized Simulated Annealing Optimization for Inversion of First-Arrival Times,” Bulletin of the Seismological Society of America, Vol. 84, No. 5, 1994, pp. 1397-1409.
 A. A. Bery and R. Saad, “Tropical Clayey Sand Soil’s Behaviour Analysis and Its Empirical Correlations via Geophysics Electrical Resistivity Method and Engineering Soil Characterizations,” International Journal of Geosciences, Vol. 3, No. 1, 2012, pp. 111-116. doi:10.4236/ijg.2012.31013