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Nature monument "Radon sources and lakes near the village of Lopukhinka."(Leningrad region).[3] / Lashkov, F. - 2016. -605: Territory..Source of an electronic copy: Committee on Natural Resources of the Leningrad Region
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Nature monument "Radon sources and lakes near the village of Lopukhinka."(Leningrad region).[3] / Lashkov, F. - 2016. -605: Territory..Source of an electronic copy: Committee on Natural Resources of the Leningrad Region
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