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https://ncerthelp.com/download/B/9844/ncert-book-class7-सामाजिक-विज्ञान-हमारा-पर्यावरण-पाठ-8-मानव-पर्यावरण-अन्योन्यक्रिया-उष्णकटिबंधीय-एवं-उपोष्ण-प्रदेश-in-Hindi-medium-download-pdf