Generalized fence diagram showing principal coal and key marine beds of Pennsylvanian age in the Hazard 30' x 60' Quadrangle, eastern Kentucky
1985 ◽
Vol 1
(3)
◽
pp. 35-40
1986 ◽
1968 ◽
1969 ◽
1965 ◽
1978 ◽
2018 ◽
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