SURFACE-UNDERGROUND METHOD FOR OPENING AND PREPARING SHALLOW COAL DEPOSITS
Keyword(s):
2017 ◽
Vol 12
(38)
◽
pp. 244-252
2017 ◽
Vol 12
(38)
◽
pp. 144-152
Keyword(s):
2018 ◽
Vol 11
(49)
◽
pp. 544-550
2017 ◽
Vol 12
(37)
◽
pp. 126-133
1953 ◽