No.	Title	Date
1	Beschermde en te beschermen vogels van de Benedenwindse Eilanden : Protected and beneficial birds of the Leeward Islands
2	Birds of Bonaire
3	Shells and shelling : hundreds of shells in color
4	Studies on the fauna of Curaçao, Aruba, Bonaire and the Venezuelan Islands
5	Zee en strand : biologie van de Nederlandse Antillen