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  1. 40704571240
    Author(s):de Sitter, W.
    Title:[The expansion of helium]
    Subject(s):Helium
    Journal Title Abbreviation:Ned. tschr. natuurk.
    Date of Publication:1934
    Pagination:1: 45–56.
    Language:Dutch
    Type of Resource:Analytic
    Series/Volume/Page:Series 4/Volume 7/Page 457
  2. 40704571700
    Title:[Obituary]
    Subject(s):Hellenberg , Josephus Maria van , 1887–1941
    Journal Title Abbreviation:Geneesk. gids
    Date of Publication:1941
    Pagination:19: 117, portr.
    Language:Dutch
    Type of Resource:Analytic
    Series/Volume/Page:Series 4/Volume 7/Page 457