02 30 00 Subsurface Investigation

02 31 00 Geophysical Investigations

02 31 13 Seismic Investigations 02 31 16 Gravity Investigations 02 31 19 Magnetic Investigations 02 31 23 Electromagnetic Investigations 02 31 26 Electrical Resistivity Investigations 02 31 29 Magnetotelluric Investigations

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