1. Uranium and thorium contents of volcanic rocks;Adams,1954
2. The abundance of potassium;Ahrens,1954
3. Uranium and thorium in sedimentary rocks;Bell,1954
4. Misure di emanazione di radon (radon exhalation measurements);Carrera,1993
5. Uranium, thorium and potassium contents in basic rocks and their bearing on the nature of the upper mantle;Heier,1964