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Interstate Engineering, Inc.
  (406) 256-1920      P.O. Box 20953, Billings, Montana 59104-095 Detail
Provides civil engineering, surveying and planning services to federal, state, local and tribal governments, environmental engineering, gls, municipal engineering.

Sk GeoTechnical.
  (406) 652-3930      2611 Gabel Road, Billings, Montana Detail
Provide the following services from both geoTechnical engineering, construction testing and special inspection.