Old Maps Online is a great portal for searching for and finding historical maps in libraries around the world.
Using a Google Maps API application it is possible to search for historical maps by location and by date. You can search for maps by searching for a location or by positioning the map over the area you are interested in, and define the date with a slide control.
The search results for the location and date defined are automatically presented in the map sidebar with a direct link to the map image on the website of the host institution.
OldMapsOnline has been created by a collaboration between The Great Britain Historical GIS Project based at The University of Portsmouth, UK and Klokan Technologies GmbH, Switzerland.
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