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200 1 $aCollected works$fNiels Bohr$ggeneral editor L. Rosenfeld
210   $aAmsterdam$cNorth Holland publ.$dcopyr. 1972..
215   $a4 v.$d27 cm
463 \1$1001990003288020203316$12001 $a<<Vol. 1:>> Early work (1905-1911)
463 \1$1001990003288030203316$12001 $a<<Vol. 3:>> <<The>> correspondence principle (1918-1923)
463 \1$1001990003288040203316$12001 $a<<Vol. 4:>> <<The>> periodic system (1920-1923)
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