TY  - JOUR
AU  - Libby Rittenberg and Ernest H. Manuel
AU  - Jr.
PY  - 1987/01//
TI  - Sources of Labor Productivity Variation in the U.S. Surface Coal Mining Industry, 1960-1976
JO  - The Energy Journal
VL  - Volume 8
DO  - 10.5547/ISSN0195-6574-EJ-Vol8-No1-6
IS  - 1
KW  - Surface coal mining
KW  - US
KW  - Labor productivity
KW  - CES production function
SN  - 1944-9089
UR  - http://www.iaee.org/en/publications/ejarticle.aspx?id=1814