1. ASTM, Standard Guide for the Use of the Time-Domain Electromagnetic Method for Subsurface Investigations, ASTM Standard D 6820, ASTM International, West Conshohocken, PA, 2004b.
2. ASTM, Standard Guide for the Use of the Frequency-Domain Electromagnetic Method for Subsurface Investigations, ASTM Standard D 6639, ASTM International, West Conshohocken, PA, 2004c.
3. ASTM, Standard Guide for the Using the Seismic Refraction Method for Subsurface Investigations, ASTM Standard D 5777, ASTM International, West Conshohocken, PA, 2004e.