Publication
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De flora van Zuid-Flevoland Article
De Korhaan, 4(10), 23-25.January 1970
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Even attentie, svp! Article
De Korhaan, 4(10), 26-26.January 1970
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Reactie op “Gierzwaluwen” (waarneming K. ten Haken) Article
De Korhaan, 4(10), 26-26.January 1970
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The Mollusca of the estuarine region of the rivers Rhine, Meuse and Scheldt in relation to the hydrography of the area. III. The genus Pisidium Article
Basteria, 34(1/2), 1-40.January 1970
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Boekbespreking Article
Basteria, 34(1/2), 41-42.January 1970
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Trachycardium porulosum (Solander) aangespoeld in Zeeland Article
Basteria, 34(3/4), 43-44.January 1970
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Notes on Kenya land and freshwater snails. 10. Variation in the Gulella ugandensis complex (Streptaxidae) Article
Basteria, 34(3/4), 45-54.January 1970
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Notes concernant Laminifera (Bofilliella) subarcuata (Bofill) Article
Basteria, 34(3/4), 55-57.January 1970