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Detection of railroad tunnel

Detection of a railroad tunel in a limestone rock covered with 2 m loam, at 15 m depth. Location area: Beijing, China. April, 2004. 100 MHz surface coupled shielded ...

Detection of cavities

Detection of cavities in a limestone rock (by 75 MHz and 38 Mhz antenna systems correspondingly), cavities at 7 m and 18 m depth, by authority of Geological Department ...