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Amazonemier (Polyergus rufescens) duikt op in de Achterhoek (Hymenoptera: Formicidae)
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De Noordse woelmuis, Microtus oeconomus Pall., in Nederland
Climatic influence on the distribution pattern of plant parasitic and soil inhabiting nematodes
Werkrapport Mergelland
Ecologisch profiel van de visdief (Sterna hirundo)