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Catena Consulting, LLC
  406.545.3075      PO Box 50538, Billings, Montana 59105 Detail
Provides a variety of professional services in support of resource development and environmental management, services include conducting environmental studies and environmental reviews.

Energy & Sustainable Design Consultants
  (406) 208-0227      1128 Noblewood Drive, Billings, Montana 59101 Detail
Offering energy and sustainable design services to design professionals, contractors, developers, and building owners.

Hardtke Enterprises, inc
  406-651-0566       280 Wind Cave Circle , Billings, Montana 59102 Detail
Specializing in alternative energy systems located in Billing Montana .