Here are a few links to external sites in which you can find more information about geophysical methods and applications.

Advanced Geosciences Inc. (AGI)

Manufacturer of ground resistivity instruments.

Association of Engineering Geologist (AEG)

Provides leadership, advocacy, and applied research in environmental and engineering geology.

Federal Lands Highway Division 

The purpose of this website is to provide highway engineers with a basic knowledge of geophysics and

nondestructive test (NDT) methods for solving specific engineering problems during geotechnical site

investigation, construction, and maintenance of highways.

Environmental and Engineering Geophysical Society (EEGS)

The website provides scientific interests, and promotes fellowhip of persons who enjoy engineering and geology.

Geomar Software, Inc.

Software for Electromagnetic Instruments and GPS Positioning.

Geometrics, Inc.

Manufacturer of magnetometers and seismographs.

Geonics, LTD.

Manufacturer of Electromagnetic Instruments.

Geostuff, Inc.

Manufacturers of borehole geophones, seismic roll box, and land streamers.

Interpex, LTD

Specialist in PC based geophysical software.

Juniper Systems

Manufacturer of field computers for geophysical data acquisition.

Sensors & Software, Inc.

Manufacturer of ground penetrating radar systems.

Subsurface Instruments, Inc.

Manufacturer of borehole magnetometers, pipe and cable location equipment, and magnetic field measuring equipment.