TY - BOOK AU - Margo,Robert A. TI - Labor market integration before the Civil War AV - HD5724 M373L PY - 1998/// CY - Cambridge, Mass PB - National Bureau of Economic Research KW - LABOR MARKET KW - UNITED STATES KW - HISTORY KW - 19TH CENTURY KW - ECONOMETRIC MODELS KW - WAGE DIFFERENTIALS KW - ECONOMIC CONDITIONS KW - TO 1865 KW - ECONOMICS KW - RESEARCH ER -