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All of these things are in 4”x6” microfiche.  The previous list does not specify for those materials, since most microfiche are 4”x6”. 
Abbreviation                                        year range    format
AD   1952-                 microfiche      Defense
AD-A  1974-  microfiche
AD-B  1946-1980  microfiche
AD-C     1950-1994     microfiche
AD-D   1976-   microfiche
AD-L   1976-1979  microfiche
AD-L-C  1978-1984   microfiche
    microfiche
    microfiche

                                      

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   August 23, 2010
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