- Raley & Assoc
- Raven Ridge Resources
- Ray A Eastman
- Red River Research
- Reg Review Inc
- Resource Engineering Inc
- RGS Geosciences
- Richard C Slade Consulting
- Richard D Robertson
- Rick Hoffman & Assoc
- Rio Delta Resources Inc
- Rmc Geo Science
- Rmc Geo Science
- Robert E Fischer
- Robert K Walker Geologist
- Roger Hively
- Rogers E Johnson & Assoc
- Roman Motyka
- Rose Exploration
- Rose Oil Co
- Rugg Geosciences Inc
- Ryan Explorations
- S G Muir
- Salem Howes Assoc Inc
- Saltmarsh Consulting Svc
- San Joaquin Energy Consultants
- Santa Ria Oil Inc
- Sarlan Resources Inc
- Schurer & Fuchs
- Shiloh Exploration
- Sierra Geotechnical
- Sierra Geotechnical
- Sisyphus Consulting
- Smith-Evernden Assoc
- Smith-Gutcher & Assoc
- Society Of Economic Geologist
- Southland Geothechnical Conslt
- Southwest Ground-Water Conslnt
- Southwestern Engineering Glgy
- Spectral International Inc
- Steven Bond & Assoc Inc
- Steven F Connelly Ceg
- Steven G Kirkwood Petroleum
- Stevens Exploration Management
- Strategic Stratigraphy
- Subsurface Consulting LTD
- Subsurface Inc
- Subsurface Surveys
- Terra Geosciences
- Terre Logics Consulting LLC
- Terry A Mayer
- Terry Orlyn
- Theodore P Paster Geologists
- Thomas G Fails
- Ticora Geosciences Inc
- Tom Gibson
- Tony V Sawyer Hydrogeologist
- Tor H Nilsen Cnsltng Geologist
- Unavco
- Unavco
- UPP Geotechnology
- US Geological Survey
- Vaughan Exploration Inc
- Waanders Palynology Consulting
- Walch Geosciences
- Western Geological Consultants
- Westwater Associates Inc
- WGM Inc
- WGR Southwest Inc
- Wheeldon Geology
- Wilde Inc
- William H Kay
- William J Elliott Geologist
- William J Hunter & Assoc
- William Lettis & Assoc
- William Lettis & Assoc
- Williston Basin Assoc
- Winona Oil Co
- Zinn Geology
