OPI Member Companies
Baker Hughes
Ecan Energy Services Inc.
Elexco Ltd.
Enbridge Gas Inc.
Examiners
LimeGREEN Equipment Rental
Oil, Gas  & Salt Resources Library
US Ecology / Environmental Services Inc.
Weatherford Canada Ltd.
Wellmaster Pipe and Supply

Sites Recommended by David Hughes
The Oil Depletion Analysis Centre
Post Carbon Institute
Financial Sense Online
From the Wilderness
Global Public Media

Canadian Oil & Gas Producer Industry Associations
Canadian Association of Petroleum Producers
Newfoundland Ocean Industries Association
Offshore/Onshore Technology Association of Nova Scotia
Small Explorers and Producers Association of Canada

Canadian Oil & Gas Service Industry Associations
Canadian Energy
Petroleum Services Association of Canada
Canadian Gas Association
Canadian Association of Petroleum Land Administration
Canadian Association of Oilwell Drilling Contractors
Canadian Society of Petroleum Geologists
Canadian Society of Exploration Geophysicists
Canadian Association of Drilling Engineers
Canadian Well Logging Society

USA Oil & Gas Industry
Energy Information Administration
Stripper Well Consortium
American Association of Petroleum Geologists (AAPG)
American Association of Petroleum Geologist Eastern Section
American Petroleum Institute
Interstate Oil & Gas Compact Commission
Petroleum Technology Transfer Centre, Appalachian Region
Petroleum Technology Transfer Centre, Michigan Region
Independent Oil & Gas Association of New York
New York State Department of Environmental Conservation, Mineral Division
New York State Energy Research Development Authority
Michigan Department of Environmental Quality
Michigan Basin Geological Society
Ohio Oil and Gas Association
Ohio Oil & Gas Energy Education Program
West Virginia Geological and Economic Survey
Illinois Oil & Gas Association

Careers
Petroleum Human Resources Council of Canada (Petroleum HR Council) – Careers in Oil & Gas

Other
Energyshop – brokers of natural gas and electricity
Search and Discovery – electronic journal for upstream energy
Petroleum Industry Training Service
Petroleum Society, Canadian Institute of Mining, Metallurgy and Petroleum
Canadian Petroleum Safety Council
Petroleum Technology Alliance Canada
Coal Association of Canada
Energy Council of Canada
Ontario Energy Board
Ontario Ministry of Environment
The Petrolia Discovery
Ontario Geosciences Resource Network
Oil & Gas Journal
Alberta Energy Utilities Board
Natural Resource Canada
Alberta Energy
Manitoba Industry, Trade and Mines
Nova Scotia Petroleum Directorate
Canada – Newfoundland Offshore Petroleum Board
Petroleum Research Atlantic Canada
Petroleum Human Resources Sector Council
University of Western Ontario
Queen’s University
Carleton University
University of Waterloo
University of Windsor
University of Toronto