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shales
shale
Last Update: 2013-07-30 Usage Frequency: 2 Quality: Reference: Wikipedia
(g) oil shales.
(g) scisti bituminosi.
Last Update: 2017-04-06 Usage Frequency: 2 Quality: Reference: Wikipedia
coal shale
scisto carbonioso
Last Update: 2014-11-15 Usage Frequency: 10 Quality: Reference: IATE