David Rumsey map collection

David Rumsey's map collection contains more than 150,000 maps and is one of the world's largest. Around 1998 Rumsey decided stopoed adding to the collection and turned his efforts to digitizing and making the collection available to others. The result is at www.davidrumsey.com - an amazing resource for history buffs and researchers. There is a short article about the collection in the July Issue of Technology Review.