Do any #Histodons or research/reference #Librarians have a good understanding of United States declassification processes in the 1960s? I have a colleague interested in why/how certain documents from the 1920s were declassified in the 1960s.
Is there an easily accessible declassification schedule somewhere that might help with such a query, or a reference source that might shed some light? The NDC site only has more recent lists as far as I can tell.
@NearerAndFarther Perhaps Matthew Connelly's book (https://www.penguinrandomhouse.com/books/545793/the-declassification-engine-by-matthew-connelly/) & the History Lab (http://history-lab.org/) could help?
@wragge Great recommendations - thank you!