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2. Geographical distribution of lead-210(RaD) in the ground-level air;PATTERSON,1964
3. Die Natürliche Radioaktivität der Atmosphäre;JACOBI;Biophysik,1963
4. Lead-210 and polonium-210 in grass;HILL;Nature,1960
5. HILL, C. R., 210PO in man, to be published in Nature.