A number of State Department agencies and commissions are important enough to have their own record group numbers. Examples:
To determine whether microfilm is available, search the National Archives Microfilm Catalog, selecting Diplomatic Records under Subject and entering the Record Group number.
The U.S. Information Agency, international public opinion, and "Public diplomacy" [microform] Microfilm 12542
Office Files or "Lot Files" (also in RG 59) are records of various offices within the Dept. of State, or relating to events, functions or special topics. There is some overlap with the material in the Central File. These files are used in preparing the FRUS volumes but very little is available on microfilm or online.
A reference guide to United States Department of State special files. Gerald K. Haines. Westport, Conn.: Greenwood Press, c1985.
Firestone Library (F) CD3031 1984
This guide covers the "Special Files" or "Lot Files" maintained by offices and individuals for reference. The office files include material that is not in the Central Files, and these files are increasingly used in preparing FRUS volumes. This guide covers 1950-1959 and is arranged by country and by bodies like committees.
The Cyprus crisis, 1967 [microform]: the State Department’s crisis files. Microfilm 12541; printed guide at Firestone Microforms DS54.9 .U548 2008