Publication
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Notes on the Pteridophytes on the Dutch West Indies Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 165(1), 297-301.January 1960
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Juglandaceae Article
Flora Malesiana - Series 1, Spermatophyta, 6(1), 143-154.January 1960
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Epacridaceae Article
Flora Malesiana - Series 1, Spermatophyta, 6(1), 422-444.January 1960
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Nyctaginaceae Article
Flora Malesiana - Series 1, Spermatophyta, 6(1), 450-468.January 1960
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Staphyleaceae Article
Flora Malesiana - Series 1, Spermatophyta, 6(1), 49-59.January 1960
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Hypericum canadense in Europe: an addition Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 166(1), 343-343.January 1960
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Celastraceae—II Article
Flora Malesiana - Series 1, Spermatophyta, 6(1), 389-421.January 1960
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Dedication Article
Flora Malesiana - Series 1, Spermatophyta, 6(1), 6-20.January 1960