A good example of a useful deep web asset is historic aerial imagery
http://learninggis.com/videos-out-on-how-to-get-free-aerial-imagery
there are some tutorials on using USGS to obtain historic imagery for GIS or other purposes.
Comment
A good example of a useful deep web asset is historic aerial imagery
http://learninggis.com/videos-out-on-how-to-get-free-aerial-imagery
there are some tutorials on using USGS to obtain historic imagery for GIS or other purposes.
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