1. Geochemical and hydrologic control on radon-222 and radium-226 in ground water;Campisano,1988
2. Recognition of microclimate zones through radon mapping, Lechuguilla cave, Carlsbad Caverns National Park, New Mexico;Cunningham;Health Phys.,1991
3. Occupational exposure to radon daughters in Mammoth Cave National Park;Eheman;Health Phys.,1991
4. Radiation exposure levels in Altamira cave;Fernández;Health Phys.,1984
5. Air circulation in caves traced by natural radon;Géczy,1989