« on: Wednesday 17 April 19 01:39 BST (UK) »
I just found an interesting resource for Illinois: The American aerial county history series, Illinois. This series of books was prepared in the 1950s. Each volume covers a county and includes maps and a brief historical account. There are also numerous aerial photos of the towns and villages and of individual homes and farmsteads - I found a good shot of a family member's farm in Winnebago County. I don't know how many counties were covered but some 30 or so are available online here:
http://www.gengateway.com/illinois/american_aerial_county_history_series.htm
Wiltshire: Banks, Taylor
Somerset: Duddridge, Richards, Barnard, Pillinger
Gloucestershire: Barnard, Marsh, Crossman
Bristol: Banks, Duddridge, Barnard
Down: Ennis, McGee
Wicklow: Chapman, Pepper
Wigtownshire: Logan, Conning
Wisconsin: Ennis, Chapman, Logan, Ware
Maine: Ware, Mitchell, Tarr, Davis