Publication
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De epiphytenflora van een Russisch loofbos Article
Buxbaumia, 5(1-2), 30-31.January 1951
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Dr. W. Meijer Article
Buxbaumia, 5(3-4), 49-49.January 1951
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Pogonatum subrotundum en P. aloides Article
Buxbaumia, 5(1-2), 32-32.January 1951
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Een recente vondst van Rhytidium rugosum (Ehrh.) Kindb. in Nederland Article
Buxbaumia, 5(1-2), 25-26.January 1951
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Verslag van de bijeenkomsten der Amsterdamse Bryologische Werkgroep in 1950 Article
Buxbaumia, 5(1-2), 35-40.January 1951
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The genus Orthodontium Article
Acta botanica neerlandica, 1(1), 3-80.January 1952
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Flower colours and their frequency Article
Acta botanica neerlandica, 1(1), 81-92.January 1952
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Reduction of two endemic monotypic Papuan genera Article
Acta botanica neerlandica, 1(1), 93-98.January 1952