La Petite Suisse Luxembourgeoise (luxembourg and germany)
It is allowed to download postcards from this site for private use, however it is always required to mention the original source if the information is to be used elsewhere on the internet. I would appreciate to be informed by mail.
It is not allowed to use the postcards or any other information for commercial purposes, as this is against international copyright laws. For any request on that matter, please send mail.