TY  - JOUR
AU  - Joe G. Baker
PY  - 1981/04//
TI  - Sources of Deep Coal Mine Productivity Change, 1962-1975
JO  - The Energy Journal
VL  - Volume 2
DO  - 10.5547/ISSN0195-6574-EJ-Vol2-No2-5
IS  - 2
KW  - Underground coal mining
KW  - Productivity change
SN  - 1944-9089
UR  - http://www.iaee.org/en/publications/ejarticle.aspx?id=1490