The ever excellent David Rumsey Map Collection has put online a huge collection of aerial photographs of San Francisco taken in 1938. They are also working hard on creating a composite image of all the images joined together.
So far 46 of the images have been stitched together and you can view the resulting aerial map of 1930's San Francisco with the help of the Google Earth browser plugin.
The images are also available as a KML which means you can examine the photos on Google Maps as well.
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nice topic
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