Ancestor Tracks has posted free, color, downloadable images from Caldwell's 1877 Atlas on-line. Ancestor Tracks is creating a one-stop clearinghouse for county landowner maps and publishing books and CDs documenting the first landowners of Pennsylvania, county-by-county. Click here to view the images.
The amazing resource, David Rumsey Map Collection, also has digital images from Caldwell's 1877 Atlas and numerous other regional resources available for free on-line. Click here to view the images.