New York : The Macmillan company ; Cambridge, Eng. : The University press, 1933.
Detalles físicos
viii, [2], 182 págs. : 2 pl. (incl. front.) ; 20 cm.
Notas
"This book is an expanded version of a public lecture delivered at the meeting of the International astronomical union at Cambridge (Massachusetts) in September 1932."—Pref.
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