Помощь ЭПСИ в его деятельности оказывают следующие организации:
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Helsinki Commission (HELCOM)
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Norwegian University Centre in St Petersburg
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UK Department for International Development (DFID)
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Danish Environment Protection Agency (DEPA)
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Canadian International Development Agency (CIDA)
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Swedish International Development Cooperation Agency (SIDA)
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Contact Expert Group
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Vodokanal of St Petersburg