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Transactions of the International Astronomical Union. Vol. VI. Sixth General Assembly h...
Transactions of the International Astronomical Union. Vol. VI. Sixth General Assembly held at Stockholm August 3 to August 10, 1938. Edited by J. H. Oort. VIII + 518 S. mit 2 Tafeln. 8°. Cambridge, University Press, 1939. Preis: geb. 21 S