http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
"A comprehensive guide to the statistical publications of the U.S. government."
"This ASI 1980-1984 Cumulative index is the first such cumulation to be issued. In addition, a cumulation covering ASI 1974 through 1979 Annual index volumes is planned, as are future cumulations on a four-year cycle." 1980-1984 Subject index, A-E, p. vii.
Cumulates index vols. of American Statistics index.