Text ( visual ) : unmediated
The periodic system (1920-1923) / edited by J. Rud Nielsen. -- Amsterdam : North-Holland , 1977. -- ix, 765 p. : ill., port. ; 27 cm. -- (Collected works / Niels Bohr ; general editor, L. Rosenfeld ; v. 4). -- Text in English, Danish and German ; Errata slip inserted ; Includes bibliographical references and index. -- ISBN 0720418046 ; (BA0439733X) ; https://ci.nii.ac.jp/ncid/BA0439733X
Author Heading(s): Bohr, Niels Henrik David ; Nielsen, J. Rud. -- Subject Heading(s): FREE : Physics
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