Cited in Bulgaria: books of ecologists of Moscow University, Russian Academy of Sciences.А.В.Яблоков, С.А.Остроумов. Уровни охраны живой природы. а. яблоков, с. остроумов „опазване на живата природа“

Cited in Bulgaria: books of ecologists of Moscow University, Russian Academy of Sciences:

А.В.Яблоков, С.А.Остроумов. Уровни охраны живой природы.

а. яблоков, с. остроумов „опазване на живата природа“

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cited the book: А.В.Яблоков, С.А.Остроумов. Уровни охраны живой природы.

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cited the book:

а. яблоков, с. остроумов „опазване на живата природа“

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