Jacobus de Korte

Birds, observed and collected by "De Nederlandse Spitsbergen Expeditie" in west and east Spitsbergen, 1967 and 1968-69; first part

Birds, observed and collected by "De Nederlandse Spitsbergen Expeditie" in west and east Spitsbergen, 1967 and 1968-69; second part

Birds, observed and collected by "De Nederlandse Spitsbergen Expeditie" in west and east Spitsbergen, 1967 and 1968-69; third and last part