Greater Allentown Grotto - A chapter of the National Speleological Society dedicated to the study and conservation of caves and their natural contents. Mid-Atlantic Karst Conservancy - Established in 1997 to preserve, acquire and manage karst areas. Includes details of current projects and contact information. Loyalhanna Grotto - Chapter of NSS since 1987. Located in Indiana, Pennsylvania and meets monthly in Apollo. Includes safety tips, equipment checklist, membership application and contacts. Pittsburgh Grotto - Chapter of the NSS. Dedicated to exploration, documentation and conservation. Features calendar of events, meeting and contact information, membership form and trip reports. Philadelphia Grotto - Chartered 1947 for cave conservation, exploration, education and research. Includes calendar of events, contacts, meeting and membership information, and articles about safety and geology. York Grotto - 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. Nittany Grotto - Chapter of the National Speleological Society meets at Penn State University. Includes contact information, calendar of events, publications and photo gallery. Franklin County Grotto - 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. Pennsylvania Cave Conservancy - 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. Huntingdon County Cave Hunters - Central Pennsylvania chapter of the National Speleological Society was founded in 1985 to explore, map, photograph and conserve caves. Includes contact information. Bald Eagle Grotto - Located in Central Pennsylvania. Founded in 1986 for exploration and conservation. Conducts cave rescue training sessions. Includes contact information.