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Sentences with phrase «existence of oil shale»
The existence of oil shale
has been well known for decades.
http://rstb.royalsocietypublishing.org/
Not exact matches
The physical
existence
of
oil
and gas in
shale
rocks was known but its development was believed to be uneconomic and it was therefore excluded from the projections.
https://dotearth.blogs.nytimes.com/
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