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Probably the images haven't been digitized. Try City Hall. There are likely a load of aerial photos that were actually taken by a guy in a plane with a camera mounted on it.
And the geography department of your local university. They will have a load of old images. That's how I learned aerial photo interp ... actually had a class in it. Another good source might be USGS. They base their quads on aerial and satellite imagery. Check to see if any of your local libraries are designated for government document storage. They might have stuff too.
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