Blanche Wiesen
Cook, an eminent historian of American foreign relations, has
noted that over two-thirds of previously
declassified State Department material relating to U.S.
involvement in Guatemala in the 1950s was
reclassified in the 1980s, despite its use in published scholarly
works.
[Blanche Wiesen Cook, "Presidential Papers in Crisis," Unpublished
paper]
-- Page Putnam Miller (Director of
the National Coordinating Committee for the Promotion of History)
In partnership with the Organization of American Historians
"Foreign Government Information: Declassification Policy
Problem" Paper II of
The Declassification Backlog of Historic Records
(December, 1994)
http://www.fas.org/sgp/eprint/legacy.html