http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Annotated bibliography of bibliographies on selected government publications and supplementary guides to the Superintendent of Documents classification system
1967- on microfiche in pocket at back of 5th-11th supplement.
1st-4th edition compiled by Alexander Body; 5th- edition compiled by Gabor Kovacs.