http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Wages and labor markets in the United States, 1820-1860
Electronic reproduction. Palo Alto, Calif. : ebrary, 2011. Available via World Wide Web. Access may be limited to ebrary affiliated libraries.
Includes bibliographical references (p. 183-194) and index.
NBER series on long-term factors in economic development