General geology and geochemistry of the Lokpanta Formation oil shale, Nigeria
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;
Soesoo, Alvar
Oil shale
2021
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p. 1-25 : ill
https://doi.org/10.3176/oil.2021.1.01
https://kirj.ee/wp-content/plugins/kirj/pub/OS-1-2021-1-25_20210222114545.pdf
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Nitrogen isotopes in kukersite and black shale implying Ordovician-Silurian seawater redox conditions
Kiipli, Enli
;
Kiipli, Tarmo
Oil shale
2013
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p. 60-75 : ill