Nigra-mara-kaspia stepo: Malsamoj inter versioj

sen resumo de redaktoj
{{Portalo Eŭropo}}
*{{en}} [http://worldwildlife.org/ecoregions/pa0814 Ekoregiono PA0814 : Nigra-mara-kaspia stepo (WWF)]
*{{en}} [http://web.archive.org/web/2006061512503920060615124358/http://www.worldwildlife.org/wildworld/profiles/terrestrial/pa/pa0814_full.html Nigra-mara-kaspia stepo (''WWF-Wildworld'')]
*{{en}} [http://web.archive.org/web/20100308064639/http://www.nationalgeographic.com/wildworld/profiles/terrestrial/pa/pa0814.html Nigra-mara-kaspia stepo (''Wildworld'')] - [[Nacia Geografia Societo]]
*{{en}} [http://www.eoearth.org/article/Pontic_steppe Nigra-mara-kaspia stepo (''The Encyclopedia of Earth'')]
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