Cambridge University have now reproduced John Speeds Theatre of the Empire of Great Britaine first published in 1611. These maps are a great insight into the area in the reign of Charles I and shows how place names have developed between Doomsday and their present forms.
South Yorkshire is shown under Yorkshire: North and East Riding and Yorkshire: West Riding whilst Nottinghamshire is listed under Nottinghamshire
The university library purchased the proof maps in 1968
The main webpage for the maps is located at http://www.lib.cam.ac.uk/deptserv/maps/speed.html