If my memory were correct, those pictures were posted on Same website long time ago. Every month Same will draw Marimite pictures and then post it like a blog. I'm not sure, but I think you might find the rest of the collection in http://doujinshi.mugimugi.org/book/334683/WSSR-Mari-Mite-White-Swimsuit-Selection-2003-2007/
Don't ask me tho, I already lost that collection due to a HD crashed years ago. T.T