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Исследования качества вод нижнего течения реки Проня методом биоиндикации.

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Исследования качества вод нижнего течения реки Проня методом биоиндикации. Учитель биологии Романов С. А. Накануне ледохода 9.04.1976. 6.04.05. 7.04.05. 8.04.05.

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Исследования качества вод нижнего течения реки Проня методом биоиндикации.

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  1. Исследования качества вод нижнего течения реки Проня методом биоиндикации. Учитель биологии Романов С. А.

  2. Накануне ледохода 9.04.1976.

  3. 6.04.05.

  4. 7.04.05.

  5. 8.04.05

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