http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Linking employment problems to economic status
Volumes for <1979>-1983 have designation from Preface.
Published 2 years after year of report coverage.
Designations for 1984- include the term "survey."
Bulletin of the United States Bureau of Labor Statistics