The map image is zoomable (try clicking on it!) and has a total resolution of 23.569 x 15.801 pixels. You can use the '+' and '-' keys (or your mousewheel) to zoom in and out, and arrow keys (or mouse) to pan.
I scanned some of the maps with a flatbed scanner at 2400dpi resolution, turned them into zoomable Web images with our excellent open source tool MagickTiler, and used the OpenZoom viewer to embed them here. The maps have meanwhile found new permant residence in an acid-free cardboard box wrapped in archive-grade polypropylene envelopes.
Thanks go out to Publishers Ernst Klett Verlag GmbH for allowing me to use the maps from this atlas on my blog!