One of the rarest colonial era maps of Virginia is A new and accurate map of Virginia wherein most of the counties are laid down from actual surveys…by John Henry, published in London in February, 1770, by Thomas Jefferys. Published cartobibliographies and descriptions of this map have reported only one known state of the map. However, Al Gore's Great Internet has allowed identification of an unrecorded first state of the map. You can read about it here:

http://blog.ncmaps.org/index.php/john-henrys-1770-map-of-virginia/

Regards,
Jay Lester
in Ould Virginia