The Primaeval State of the Earth 7 



REFERENCES 



1. G. KuiPER, J. R. astr. Soc. Can., 50, 158, 1956. 



2. H. Brown, Rare gases and the formation of the Earth's atmosphere; In The 



Atmospheres of the Earth and Planets (Ed. by G. KuiPER). Univ. Chicago Press, 



1947- 



3. V. G. Fesenkov & A. G. Masevich, Astr. Zh. S.S.S.R., 28, 317, 1951. 



4. K. B. Baldwin, The Face of the Moon. Chicago, 1949. 



5. H. Urey, The Planets, their Origin and Development. Yale Univ. Press, New Haven, 



1954- 



6. J. Spurr, Geology Applied to Selenology. Science Press, Lancaster, 1945. 



7. P. PuiSEUX, La terre et la lune. Gauthier-Villars, Paris, 1908. 



8. H. WiLKENS & P. Moore, The Moon. London, 1955. 



9. J. A. Jacobs & D. W. Allan, Nature, Lond., 177, 155, 1956. 



10. E. A. Lyublmova, DoM. Akad. Nauk S.S.S.R., 107, 55, 1956. 



E. A. Lyubimova, Izv. Akad. Nauk S.S.S.R., Ser. Geophys., No. 5, 416, 1955. 



11. E. Opik, Irish astr. J. 3, No. 7, 1955. 



12. V. A. Obruchev, The Principles of Geology. Akad. Nauk S.S.S.R., Moscow, 1956. 

 O. Fr. Tuttle, Sci. Amer., 192, 77, 1955. 



P. N. Kropotkin, Priroda, Leningr., No. 4, 31, 1956. 



13. A. P. Pavlov, Volcanoes, Earthquakes, Seas, Rivers. Moscow, 1948. 



14. L. K. Grayton, Conjectures regarding volcanic heat. Amer. J. Sci., 243-A, 1945. 



15. H. Jeffreys, The Earth. Cambridge Univ. Press, 1952. 



16. V. GOLDSCi-iMiDT, Naturwissenschaften, 18, 999, 1930. 



17. E. Holmes, Geol. Mag., 2, 322, 1915. 



