NOAA > NCEI (formerly NGDC) > Geomagnetic Data & Info > HDGM Home
HDGM Current License Holders

Altitude Energy Partners
Baker Hughes
CGGVeritas Services (US) Inc.
Halliburton
Leam Drilling Systems
Patterson-UTI
ProDirectional
roundLab Inc.
Schlumberger
Scientific Drilling
Shell
SOREQ NRC
Southwestern Energy Company
Quintana Energy Services
Weatherford