In 1995, historical satellite imagery collected by the Corona satellite program between 1959 and 1972 was declassified (http://www.nro.gov/corona/facts.html), and made available for purchase, through the USGS (http://bit.ly/aNowjB) or can be accessed by visiting the National Archives. The imagery has been invaluable for use in environmental research, measuring changes over the past decades, among other purposes. (http://bit.ly/9rTLVn) ...more »
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