Wat is de oorzaak van de achteruitgang van onze zwaluwen?

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Journal	Natura
Rights	CC BY 3.0 NL ("Naamsvermelding")
Organisation	Natuurvereniging KNNV
Citation APA APA Style APA-ALL Style AAA Style Cell Style Chicago Style Harvard Style IEEE Style MLA Style Nature Style Vancouver Style American-Institute-of-Physics Style Council-of-Science-Editors Style BibTex Format Endnote Format RIS Format CSL Format DOIs only Format	J. Ivangh. (1956). Wat is de oorzaak van de achteruitgang van onze zwaluwen?. Natura, 53(11), 145–147.

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