On the server, the maps are stored in the Deep Zoom Image format. For viewing Seadragon Ajax is used. Most of the maps are also available as 300 dpi JPEG (under the link title "Download entire map").
All descriptions of the maps are taken from the imprint (if present) of the map or the comprising atlas / book. In the other cases, they originate either from the previous owner or from internet research. It is well possible that indications of the publishing year or the author / publisher are imprecise, especially for maps which have been repeatedly republished with only small changes. The size (height x with in cm) always refers to the actual map, i.e. the sheet border and the decorative border are not included.
If you'd like to use a map or a section thereof for a publication, you are free to do so. I would be pleased if you send me a short message and, after publication, a specimen copy.