To promote international cooperation in the application and use of mathematics in geological research and technology.

Amateur geological society with field trip reports, lecture programme, events calendar and articles.

Advancing the geosciences, enhancing the professional growth of its members, and promoting the geosciences in the service of humankind.

Texas section of the American Institute of Professional Geologists (AIPG). Representing geologists in Texas, U.S., and overseas.

Informal group with organises a series of lectures aimed at amateur and professional geologists. Also information about field trips and geological field guides.

For scientists and engineers involved with coal petrology, kerogen petrology, organic geochemistry and related disciplines.

Promotes geology as a profession and as a science; offers scholarships, professional workshops, and field trips.

A national geoscience society, publisher and distributor of quality geoscience publications and journals, including Geoscience Canada, GEOLOG, Geotext, and Palaeontographica Canadiana.

UK society which publishes "Humberside Geologist." Site includes membership information and schedule of events.

Extensive network of international petroleum engineers.