www.aapg.org 
American Association of Petroleum Geologists

www.aapg.org/global/europe
AAPG Europe Region

www.eage.org
European Association of Geoscientists & Engineers

www.eurogeologists.eu
European Federation of Geologists

www.kngmg.nl 
Koninklijk Nederlands Geologisch en Mijnbouwkundig Genootschap, (Dutch Geological Society).

www.pesgb.org.uk 
Petroleum Exploration Society of Great Britain

www.spe.org
Society of Petroleum Engineers