http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Fifteenth Census of U.S., 1930. Construction industry
Reports by States with statistics for counties and cities of 100,000 population and over, summary for U.S., and study of location and agencies of construction industry
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2014. digital, PDF file. ProQuest U.S. Executive Branch Documents Mode of access: World Wide Web via ProQuest website.