Here&#x27;s more details (at least the unclassified ones) from the NRO site:
<a href="http:&#x2F;&#x2F;www.nro.gov&#x2F;history&#x2F;csnr&#x2F;corona&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.nro.gov&#x2F;history&#x2F;csnr&#x2F;corona&#x2F;</a><p>And a press release on the 50th anniversary of first launch:
<a href="http:&#x2F;&#x2F;www.prnewswire.com&#x2F;news-releases&#x2F;first-successful-corona-remote-sensing-satellite-built-by-lockheed-martin-marks-50-year-anniversary-101470949.html" rel="nofollow">http:&#x2F;&#x2F;www.prnewswire.com&#x2F;news-releases&#x2F;first-successful-cor...</a><p>(the press release has an obsolete link for the NRO page; the one I put at top here is correct)