COAL RESOURCE ASSESSMENT IN THE UNITED STATES
1979 ◽
pp. 465-471
1987 ◽
Vol 24
(4)
◽
pp. 145
Keyword(s):
1978 ◽
Vol 117
(1-2)
◽
pp. 160-171
◽
Keyword(s):
1979 ◽
pp. 160-171
◽
1981 ◽
Vol 92
(8)
◽
pp. 520
Keyword(s):
Keyword(s):