Summarises the knowledge of caves that has developed since the first Bulgarian caving society was founded in 1929.
Co-published with the Bulgarian Federation of Speleology and the National Museum of Natural History.
Foreword - Acknowledgements - Historical Review of Bulgarian Speleology - Education of Cavers - Cave Rescue in Bulgaria - International Connections of Bulgarian Speleologists - Activities of Bulgarian Speleologists in Exploring the Caves and the Karst of the World - Scientific Exploration of Bulgarian Caves - Plant and Animal Life in Bulgarian Caves - Cave Flora - Cave Fauna - Archaeological Research in Bulgarian Caves - Palaeontological Research in Bulgarian Caves - Cave Minerals in Bulgaria - Hydrogeological, Hydrological and Hydrochemical Research in Bulgarian Caves - Geomorphological and Geophysical Research in Bulgarian Caves - Physiological and Psychological Research in Bulgarian Caves - Climatological Research in Bulgarian Caves - Cave Diving in Bulgaria - Cave and Karst Protection in Bulgaria - Karst and Caves in Bulgaria - The Longest Caves and the Deepest Cave Systems in Bulgaria - Caves and Potholes Included in This Book - Some Remarkable Bulgarian Caves - Caves in the Danube Plain - Caves in Stara Planina and the Predbalkan - Caves in Pirin - Caves in the Transitional Region - Caves in the Rhodopes - Who is Who in Bulgarian Speleology - Selected Literature on the Karst and Caves in Bulgaria