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Полезные ресурсы
Исследования учащихся Вода для жизни
Другие документы
1. Энциклопедия для детей: Т.3 (География). - Сост. С.И. Исмаилова. - М.: Аванта +, 1994.
2. В.М. Константинов. «Охрана природы», 2001 г.
3. Д. Касаткин. Природа и человек. Вода источник жизни.