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Iris Dataset
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KukerOilShale_ENG_062011_100dpiS.pdf
KukerOilShale_ENG_062011_100dpiS.pdf
http://www.gi.ee/geoturism/KukerOilShale_ENG_062011_100dpiS.pdf
Graptolitic argillite
History of the oil shale industry
Oil shale in Estonia
Viru Keemia Grupp
Link from a Wikipage to an external page
KukerOilShale_ENG_062011_100dpiS.pdf
http://www.gi.ee/geoturism/KukerOilShale_ENG_062011_100dpiS.pdf