The world’s single largest online collection of historical maps launched earlier this week at Old Maps Online. By the end of the year, the site aims to have 60,000 maps available for public access. Cooperating institutions include the British Library, the National Library of Scotland, the Czech Republic’s Moravian Library and the San Francisco Bay Area’s David Rumsey Map Collection. The University of Portsmouth’s Great Britain Historical Geographical Information System hosts the collection in conjunction with Switzerland’s Klokan Technologies.
Having such a large collection of cartographic history in one place and accessible by anyone with a browser is extraordinary enough. But it's not the only online map collection of note. The University of Texas’s Perry-Castañeda Library Map Collection has been a familiar online companion from the early days.
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from Ars Technica http://arstechnica.com/index.php