My early memories of Fritz Houtermans, by G. Gamow.--Early history of the earth, by W. M. Elsasser.--Radioactive heat production in eclogite and some ultramafic rocks, by G. R. Tilton and G. W. Reed.--Some recent researches on lead isotope abundances, by R. D. Russell.--The concentration of common lead in sea water, by M. Tatsumoto and C. C. Patterson.--Rates of sediment accumulation in the Indian Ocean, by E. D. Goldberg and M. Koide.--The natural distribution of radiocarbon: mixing rates in the sea and residence times of carbon and water, by H. Craig.--On the investigations of geophysical processes using cosmic ray produced radioactivity, by D. Lal.--Neutrons in meteorites, by P. Eberhardt, J. Geiss and H. Lutz.--The tritium content of atmospheric hydrogen and atmospheric methane, by F. Begemann.--Tritium in rainwater, by H.v. Buttlar.--Cosmic ray produced Na22 and Al26 activities in chondrites, by M. M. Biswas, C. Mayer-Boricke and W. Gentner.--Isotopic and chemical composition of some terrestrial natural gases, by G. J. Wasserburg, E. Mazor, R.E. Zartman.--Rare gases in the sun, in the atmosphere, and in meteorites, by P. Signer and H.E. Suess.--The half-life of 187Re, by B. Hirt [and others]--Reversible and irreversible thermal effects on the thermoluminescence of limestone, by E. J. Zeller and L.B. Ronca.
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