Crew is dedicated to exploration, surveying and preservation. Includes trip reports, field notes, databases, photos and contacts.

Based in Horse Cave, Kentucky. Dedicated to preservation of karstlands. Includes membership application, volunteer projects, news, events and contacts.

An overview of the formation of caves, cave conservation, photography and wildlife together with local educational resources. Diagrams, pictures and slide shows.

A wide-ranging introduction to the geology of caves. Organised by geological feature with pictures and clickable virtual maps.

The National Body for Caving in England, Scotland and Wales.

Advice for the caving and medical community on Leptospira Bacterium including symptoms and treatment.