http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1977 census of the construction industries
industry series, highway and street construction contractors, SIC code 1611
Census of construction industries (1977)
Highway and street construction contractors, SIC code 1611
29 pages in various pagings : graphs ; 28 cm.