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https://ncerthelp.com/download/B/9362/ncert-book-class10-सामाजिक-विज्ञान-समकालीन-भारत-पाठ-7-राष्ट्रीय-अर्थव्यवस्था-की-जीवन-रेखाएँ-in-Hindi-medium-download-pdf