All pictures on this site were made by Gerard Visser (Aadorp, Netherlands), unless stated otherwise. All rights remain with him. These pictures may not be used for purposes any other than private viewing or printing. Should you need them for purposes which include third parties, you must ask the athour permission by e-mail. People, who want to use this pictures for exhibitions or publications or educative material are encouraged to do so after approval as mentioned and giving the normal credits.