Australian Policy Regarding the Indigenous Population (End of the XIXth Century – the First Third of the XXth Century) за авторством Yu. Perha

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Outstanding Ukrainian artists in Australia: Vasil Tsybulsky за авторством Yu. Perha

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Environmental Aspects of the New Deal of US President Franklin Roosevelt за авторством Yu. Perha

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Theodore Roosevelt's Policy in the Field of Ecology: Conservation Natural Resources за авторством Yu. Perha

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Hungary Relations with Neighboring Countries in the XX – early XXI Century за авторством Yu. Perha

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