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• Geochemical heterogeneity of Estonian graptolite argilliteVoolma, Margus; Soesoo, Alvar; Hade, Sigrid; Hints, Rutt; Kallaste, ToivoOil shale2013 / p. 377-401 : ill https://artiklid.elnet.ee/record=b2633538*est https://doi.org/10.3176/oil.2013.3.02 https://www.scopus.com/sourceid/17080 https://www.scopus.com/record/display.uri?eid=2-s2.0-84882777831&origin=resultslist&sort=plf-f&src=s&sot=b&sdt=b&s=DOI%2810.3176%2Foil.2013.3.02%29&relpos=0 https://jcr.clarivate.com/jcr-jp/journal-profile?journal=OIL%20SHALE&year=2013 https://www.webofscience.com/wos/woscc/full-record/WOS:000323548500002
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• GIS applications in the studies of the Palaeozoic graptolite argillite and landscape change = GIS meetodite rakendused Paleosoikumi graptoliit-argilliidi ja keskkonnaseisundi muutlikkuse uuringutesHade, Sigrid2014 https://digi.lib.ttu.ee/i/?1259 https://www.ester.ee/record=b4412604*est
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