http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Issues for 19 -1979 have supplement: Bureau of the Census catalog. Monthly supplement.
Bureau of the Census catalog. Monthly supplement
Catalog of United States census publications
Supt. of Docs., U.S. Govt. Print. Off., Washington, D.C. 20402