TY - BOOK AU - Goldin,Claudia AU - Katz,Lawrence F. TI - Education and income in the early 20th century : evidence from the prairies AV - HD4939 .U6 G642E PY - 1999/// CY - Cambridge, Mass. PB - National Bureau of Economic Research KW - WAGES KW - EFFECT OF EDUCATION ON KW - IOWA KW - HISTORY KW - 20TH CENTURY KW - WAGES FIFFERENTIALS KW - EDUCATION KW - ECONOMIC ASPECTS KW - ECONOMETRIC MODELS ER -