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57. L. GuREViCH. In Voprosy kosmogonii (ed. B. V. Kukarkin). 



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59. H. Kramers and D. ter Haar. Bull. astr. Insts Netherlds, 



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61. D. R. Bates and L. Spitzer. Astrophys. J., 11^, 441 (1951). 



62. H. N. Russell. The solar system and its origin. New York, 



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63. G. P. KuiPER (ed.) The atmospheres of the Earth and planets 



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64. A. Adel and V. M. Slipher. Phys. Rev., 46, 902 (1934). 



65. G. P. KuiPER. Astrophys. J., 100, 378 (1944). 



66. F. W. Clarke. Prof. Pap. U.S. geol. Surv., i^2D, 51 (1924). 



67. H. S. Washington. Amer. J. Sci. (ser. 5), p, 351 (1925). 



68. V. M. GoLDSCHMiDT. Gcochemische Verteilungsgesetze der 



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69. I. NoDDACK and W. Noddack. Natunoiss., 18, 757 (1930). 



70. A. Fersman. Geokhimiya. Vols. 1 and 2. Moscow (ONTI), 



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71. H. Brown and C. Patterson. /. Geol., ^^, 405 (1947). 



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74. S. Orlov. Vestnik Moskov. Univ. Ser. Fiz.-Mat. i Estestven. 



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