I initially got pretty excited by this discovery on http://earthexplorer.usgs.gov/ as some of the imagery is 2-4 ft in resolution and dates from the mid-60’s to mid-70’s. It was de-classified in two batches; 1996 and 2002. However, it seems that most of the imagery is quite cloudy (coincidence ?) and there is not much of the 2-4 ft stuff. Additional frustrations are that is costs money (alebeit a small amount – around $30) and cannot be downloaded. But anyone determined enough should be able to their hands on this.
I’m sure there a much larger collections that are not yet de-classified, covering the entire Khmer Rouge period in Cambodia. I wonder why.