Do look at Geotool, it's very impressive.
Geotool
The map collection of Goettingen State and University Library contains more
than 300,000 maps, of which 65,000 are antique maps and more than 5,000
atlases. The new inventory 'Geotool', a digital visual gateway to map
series, has been developed by the map collection and offers the following
possibilities of geographical research in the Internet:
-a graphical user interface for map research in different sheet line systems
-in different scales
-with different subjects
-in different dates of publication
-worldwide
The system is still under construction. The work of the cataloguing and the
adding of further map sheets to Geotool are an ongoing process.
<http://www.geotool.org>
Quoted from that marvelous newsletter Cartographiti, issue 69, page 17.
Best wishes
Tinho
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