The six declassified WWI-era documents are housed at the National Archives.
Sources
- Secret Writing: CIA's Oldest Classified Documents - CIA (cia.gov)
- https://irp.fas.org/news/2011/04/cia041911.html (irp.fas.org)
- https://www.npr.org/2011/04/20/135578901/cia-declassifies-its-oldest-secret-documents (npr.org)
- https://www.cbsnews.com/news/cia-reveals-wwi-invisible-ink-recipe/ (cbsnews.com)
- https://www.flickr.com/photos/usnationalarchives/albums/72157626452036717/ (flickr.com)
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