Background
While looking at the Intellipedia entry on the 
National Reconnaissance Office (NRO), I came across a reference to the “NRO Satellite Resource Guide” under the “Suggested Readings” heading.
In September of 2017, I requested this document from the NRO, along with all other available versions of it. The Intellipedia page referenced a 2011 version, but that may have been a out of date reference, so I sought all versions available.
I was sent 5 versions of the document, from various dates. I put them in one .pdf below, and added bookmarks marking each version.
Document Archive
The National Reconnaissance Office (NRO) Satellite Resource Guides, Released December 2017 [133 Pages, 7.1MB]
https://documents.theblackvault.com/documents/nro/satelliteresourceguide-dec2017.pdf
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