or Infourok : Teachers often upload scanned PDF versions or teaching materials based on this specific book.
: Search for "Экология Никишов 5-6 класс." These are common places to find older editions.
: This site specializes in used books and often lists specific older textbooks like this one. 3. Online Libraries and Media Centers
: For modern alternatives if you cannot find the Nikishov edition, the Prosveshcheniye Mediateka offers digital forms of current ecology textbooks for grades 5 and 6.