আলতাফ হোসেন,৪র্থ শ্রেনী,বিষয়-বাংলাদেশ ও বিশ্ব পরিচয়,অধ্যায় ১২,পাঠেৱ শিৱোনাম-দুর্যোগ মোকাবেলা(প্রঃউঃ) Date: 22-10-2020

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