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2001Energy: Vol. 26, Issue 11The effect of restructuring on US coal mining labor productivity, 1980–1995M. Kuby, Z. Xie
1987The Energy Journal: Vol. 8, Issue 1Sources of Labor Productivity Variation in the U.S. Surface Coal Mining Industry, 1960-1976Libby Rittenberg, Ernest H. Manuel, Jr.
1984International Journal of Health Services: Vol. 14, Issue 3Productivity and Safety in Worker Cooperatives and Conventional FirmsLeon Grunberg, Jerry Everard, Mary O'Toole


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