De vierde Big Day

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Journal	De Gierzwaluw
Rights	CC BY 3.0 NL ("Naamsvermelding")
Organisation	Vogelwerkgroep Amsterdam
Citation APA Style AAA Style APA 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	F. van Groen. (2007). De vierde Big Day. De Gierzwaluw, 45(2), 9–15.

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