Hertfordshire Natural History Society
- Describes this organisation and its specialist groups. Includes publication contents lists, programme and information about membership.
- http://www.hnhs.org/

Hertfordshire Geological Society
- Profile, meetings, field trips and archives.
- http://www.hertsgeolsoc.ology.org.uk/

East Herts Geology Club
- Profile, meetings, local geology and merchandise.
- http://www.ehgc.org.uk/

Countryside Management Service
- Works with communities in Hertfordshire to help them to care for and enjoy the environment. Background information, details of events, opportunities for volunteering, and newsletters.
- http://enquire.hertscc.gov.uk/cms/