The David Rumsey Map Collection is a great resource for historical maps, and the Georeferencer feature is a cool way to overlay historic maps over a modern map and adjust the opacity to compare the two.
IntelliKeys USB for only $395 If you're using IntelliKeys with USB computers we've got good news! Please note:License Type Price Item Number IntelliKeys USB (includes 1 USB cable) $395.00 W139459 Access Bundle No. 4 (Includes IntelliKeys USB and Overlay Maker 3) $510.00 W139651 Access Bundle No.