Publication
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On phototropic Curvatures in Avena, caused by photochemical Inactivation of Auxin-a via its Lactone Article
Recueil des travaux botaniques néerlandais, 35(1), 1-13.January 1938
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Bryologiese Notities III Article
Nederlandsch kruidkundig archief. Serie 3, 48(1), 266-277.January 1938
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Mei Article
De Levende Natuur, 43(1), 30-31.January 1938
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De Amstel Article
De Levende Natuur, 43(4), 119-121.January 1938
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Jaarverslag over 1937 Article
Limosa, 11(2), 142-143.January 1938
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Korte mededeelingen Article
Limosa, 11(2), 68-69.January 1938
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De broedvogels van den Wieringermeerpolder in 1937 Article
Limosa, 11(2), 7-9.January 1938
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Ornithologie van Nederland 1938, 1e mededeling Article
Limosa, 11(2), 46-50.January 1938