Over the years, the Central Intelligence Agency has released redacted versions of every President's Daily Brief from 1961 to 1977.  They are, of course, available via the CIA website, but there are thousands of PDFs and tens of thousands of pages.  David Priess wrote an excellent book about the PDB and the CIA has produced a number of monographs, but I think it's fair to say that there's a lot more that could be learned about the role of the PDB in modern presidential & international history.

As a publisher, I'm always thinking about "hooks" for series, and as I pondered "what was happening fifty years ago?" it occurred to me that it might be an interesting exercise to proceed through the PDBs one day at a time. So ... watch my Twitter feed @fredzannarbor for daily comments about each PDB under the hashtag #PDB50 and check out Amazon, where I have provided conveniently bound and printed collections of the complete PDBs from fifty years ago.  I have also provided a Google Docs version of each month's volume that can be edited to provide insight and context.

Month Print Crowd-sourced
January 1971 Amazon pb, Amazon hc Google Drive
February 1971 Amazon pb TK
March 1971 Amazon pb TK
April 1971 Amazon pb TK
May 1971 Amazon pb TK