Coal mining technology :
Stefanko, Robert,
Coal mining technology : Theory and practice / By Robert stefanko ; ed. christopher j. bise - 410 páginas
0895204045
Minas de carbón
TN803 / S83
Coal mining technology : Theory and practice / By Robert stefanko ; ed. christopher j. bise - 410 páginas
0895204045
Minas de carbón
TN803 / S83