The Library’s subscription to ProQuest’s Sanborn Maps, 1867-1970, provides digital access to large-scale maps of Virginia towns and cities. Users have the ability to easily manipulate the maps, magnify and zoom in on specific sections. Digital Sanborn Maps was created from ProQuest's microfilm collection of Sanborn Maps, which were filmed from the Library of Congress' collection. The Library of Congress’ Sanborn collection includes all maps submitted to them through copyright deposit and a set of maps transferred to the Library from the Bureau of the Census. Maps from the Bureau of the Census include corrections issued by the Sanborn Company that were pasted over the original map sheet. Maps acquired through copyright deposit remain in their original form.