definition of oil shale
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definition of oil shale
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what is shale oil
what is shale in oil and gas
the definition of shale
what is the meaning of shale
difference between shale oil and oil shale
shale oil vs oil shale
what is a shale
what are oil shales
shale meaning in english
shale gas and shale oil
introduction to oil shale
how is oil shale formed
is shale a word
definition of oil shale, oil shale definition science, oil shale simple definition, what is shale oil, what is shale in oil and gas, the definition of shale, what is the meaning of shale, difference between shale oil and oil shale, shale oil vs oil shale, what is a shale, what are oil shales, shale meaning in english, shale gas and shale oil, introduction to oil shale, how is oil shale formed, is shale a word
