http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
U.S. Dept. of Labor, Bureau of Labor Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Compilation of articles on findings of the Bureau of Labor Statistics, published between Jan. 1969, and Jan. 1975, in the Monthly labor review.
Bulletin of the United States Bureau of Labor Statistics ; 1868