DUPOND CH Dutch names for the plumage of birds
[samenvatting] [summary] [free pdf]

HENS PA & MARLE JG VAN Aantekekeningen omtrent enkele vermeende subspecies van de vink Fringilla coelebs
no title in English available
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BOUMA JP & KOCH JC Occurrence and migration of Eurasian Siskin Carduelis spinus
[samenvatting] [summary] [free pdf]

WIGMAN AB Een grauwe franjepoot Phalaropus lobatus in de Geldersche Vallei
no title in English available
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EYKMAN C Vergadering te Rotterdam in Bellevue op 24 September 1933
no title in English available
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KOCH JC & VRIES TG DE Necrologie
no title in English available
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KATE CGB TEN Literatuur
no title in English available
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