Penn Pilot Photo Center is a collection of aerial photos of Pennsylvania. The three period are 1937-1942, 1957-1962 and 1967-1972.
http://www.pennpilot.psu.edu/
These are the actual photos taken, no writing other then the date photo was taken (thus best used with Google Maps and try to determine what field is where and then use Google earth for actual streets and town names). You be surprised by what was open fields in 1939 but are 'forest' today. Here is downtown Pittsburgh on three different dates (Penn Pilot has three levels of photos for each series of photos, my computer can NOT handle the better two downloads so you are stuck with the downloads with the least pixels of each of the three time periods).
May 17, 1939:
May 7, 1957:
May 26, 1967:
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