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CHANGES IN THE SKILL REQUIREMENTS OF THE U.S. LABOR FORCE: 1960-85
Howell, David R., (1988)
Labor Quality and Productivity Growth in the U.S.: An Input-Output Growth Accounting Framework
Howell, David R., (1987)
TECHNICAL CHANGE AND THE DEMAND FOR SKILLS BY U.S. INDUSTRIES
Howell, David R., (1990)