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  1. By: Vorderman, A.G. (Adolphe Guillaume)
    Type: Article
    In: Notes from the Leyden Museum
    Volume: 13
    Date: 1891
    Page Range: 121--130
    Publication Info: Leyden, E.J. Brill, 1880-1914
  2. By: Vorderman, A.G. (Adolphe Guillaume)
    Type: Article
    In: Natuurkundig tijdschrift voor Nederlandsch Indië
    Volume: v.59 1900
    Date: 1900
    Page Range: 140-197
    Publication Info: Batavia, Lange, 1851-