• AAPG
  • AAPL
  • American Geological Institute
  • American Petroleum Institute
  • API - Energy Tomorrow
  • Bloomberg Energy New
  • DOT National response center
  • Energy Information Administration
  • Energize Your Future with Shell
  • Geology.com
  • Geological Society of America
  • How Stuff Works
  • IHS Energy Group
  • IOGCC
  • Illinois Department of Natural Resources
  • IOGA IL Oil & Gas Assoc
  • Illinois Oil Field Museum
  • Illinois State Geological Survey
  • Independent Petroleum Assoc of America
  • IL Oil and Gas Resource (ILOIL) Maps
  • Nat’l Assoc. of Royalty Owners
  • OERB
  • OPEC
  • Office of fossil fuel
  • Ohio Oil & Gas Association
  • Society of Petroleum Engineers
  • USEPA
  • US Dept. of Energy
  • U. S. Geological Survey