Publication
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The Birds of Aruba, Curaçao, and Bonaire Article
Studies on the Fauna of Curaçao and other Caribbean Islands, 7(1), 1-260.January 1957
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Personal news Article
Flora Malesiana Bulletin, 13(1), 549-553.January 1957
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Parnassiana nova : XV. Kritische Revision der Gattung Parnassius (Fortsetzung 10) Article
Zoologische Mededelingen, 35(14), 177-203.January 1957
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A systematic review of the Indo-Australian Zosteropidae (Part I) Article
Zoologische Verhandelingen, 35(1), 1-204.January 1957
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Parnassiana nova : XVII. Kritische Revision der Gattung Parnassius (Fortsetzung 12) Article
Zoologische Mededelingen, 35(20), 283-298.January 1957
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Notes sur les Orgeriini d'Espagne (Homoptera) Article
Zoologische Mededelingen, 35(1), 1-7.January 1957
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Parnassiana nova : XIII. Vier neue Hybriden Article
Zoologische Mededelingen, 35(5), 51-53.January 1957
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Notes on Rhizocephala of the genus Loxothylacus Article
Zoologische Mededelingen, 35(12), 153-160.January 1957