Publication
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Notonectidae of Suriname with additional records of other neotropical species Article
Studies on the Fauna of Suriname and other Guyanas, 10(1), 110-136.January 1968
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Insect collecting in Suriname with the help of “Malaise” traps Article
Studies on the Fauna of Suriname and other Guyanas, 10(1), 101-109.January 1968
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Review of marine biological studies on the Guyana shelf Article
Studies on the Fauna of Suriname and other Guyanas, 10(1), 137-152.January 1968
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Two Gall Midges from Surinam (Diptera, Cecidomyiidae) Article
Studies on the Fauna of Suriname and other Guyanas, 10(1), 61-66.January 1968
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The marine Algal Vegetation of St. Martin, St. Eustatius and Saba (Netherlands Antilles) Article
Studies on the Flora of Curaçao and other Caribbean Islands, 2(1), 1-120.January 1968
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Foraminifera from the Bay of Jakarta, Java Article
Bijdragen tot de dierkunde, 37(1), 11-35.January 1968
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List of scientific publications by Professor Dr. H. Engel Article
Beaufortia, 15(180), 7-14.January 1968
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Ornamental shell festoons of the Oostkerk at Middelburg Article
Beaufortia, 15(181), 15-20.January 1968