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Prange's "At Dawn We Slept: The Untold Stroy of Pearl Harbor" is quite an interesting publishing story in itself.

It was really completed by two of Prange's students [Donald Goldstein and Katerine V. Dillon] - Prange died in May 1980.

The appendix they added attempted to refute all revisionist claims and concluded with "in a thorough search of more than 30 years, including all publications released up to May 1, 1983, we have not discovered ..." Their claim was not quite true ... They never saw SRH-051, for example.

And as the years have passed more and more materials have been released ...

Stinnett's paperback is likely the most current in the US.

Timothy Wilford's Master Thesis (University of Ottawa) in History is noted in Stinnett's Afterword source notes ...

John Costello still "pulls" the Foreign Office chain ... gets ... " release is not in the national interest at this time."

I surmise that there is an explicit agreement between US/England/Austrialia/Canada/Dutch/ ... that the release of pre-Pearl Harbor materials be timed and coordinated together.

As to Timothy Wilford's master thesis, you should know that he was (or is) a student of another revisionist conspiracy theoriest, Professor Brian Villa of the University of Ottawa, Canada. Thus, this poor grad student had to write his thesis to get his professor's favor as opposed to performing objective historical research. Even Wilford backtracked considerably from his original position when engaged in discussions on H-DIPLO. Villa was greatly displeased by the opposition voiced by Stephen Budiansky, the author of "Battle of Wits", Ralph Erskine and myself on H-Diplo during February 2001. See H-DIPLO discussion logs for that month as well as November, December 2000 and January 2001 available at their internet site.

Wilford admitted some of his errors and lamely fell back on SRH-355, which clearly referred to JN-25A not JN-25B by its time frame. The best records on JN-25B decrypts are found in "The History of OP-20-GYP" in the Crane Files at the National Archives. Essentially, no formal decrypts were ever made before Pearl Harbor. I have copies of the first 25 decrypts made by the U.S. Navy and they start with one in January, 1942, two or three in February and the rest in March, 1942. British records also do not show any such JN-25B decrypts until 1942.