Located in Central Pennsylvania. Founded in 1986 for exploration and conservation. Conducts cave rescue training sessions. Includes contact information.

Chapter of the NSS since 1981 and based in New Franklin. Dedicated to exploration and conservation. Includes meeting and membership information, trip reports and contacts.

A chapter of the National Speleological Society dedicated to the study and conservation of caves and their natural contents.

Central Pennsylvania chapter of the National Speleological Society was founded in 1985 to explore, map, photograph and conserve caves. Includes contact information.

Chapter of NSS since 1987. Located in Indiana, Pennsylvania and meets monthly in Apollo. Includes safety tips, equipment checklist, membership application and contacts.

Established in 1997 to preserve, acquire and manage karst areas. Includes details of current projects and contact information.

Chapter of the National Speleological Society meets at Penn State University. Includes contact information, calendar of events, publications and photo gallery.

Affiliate of the National Speleological Society. Mission is to protect cave resources within the Mid-Appalachian Region (Pennsylvania, Maryland, New Jersey and Delaware). Open to member grottos in the MAR. Includes contacts and calendar.

Chartered 1947 for cave conservation, exploration, education and research. Includes calendar of events, contacts, meeting and membership information, and articles about safety and geology.

Chapter of the NSS. Dedicated to exploration, documentation and conservation. Features calendar of events, meeting and contact information, membership form and trip reports.

Dedicated to discovery, exploration, conservation, preservation and historical research in Southeastern Pennsylvania. Includes membership requirements and contact information.

Chapter of the National Speleological Society. Advocates scientific study of caves, surveying, conservation and historical studies. Includes meeting and membership information, upcoming events and contacts.