Over 3,000 (primarily) 19th century maps in books from the British Library collections have been extracted from the scanned volumes and they need your help georeferencing and overlaying the scanned maps. To help, visit http://www.bl.uk/maps/ .

The images are public domain and may be downloaded from Flickr (jpeg), and the overlays (kml) and coordinate data (wld) from BL Georeferencer.