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Author: Abdus Shaheed Nasim
Source : Islamic Boi Somahar
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Author: Narlikar, J. V.
Source: National Digital Library Of India
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Author: Narlikar, J. V.
Source: National Digital Library Of India
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Author: Narlikar, J. V.
Source: National Digital Library Of India
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Author: Jamil Chowdhury
Source: Pdf Drive
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Class: Nine & Ten
Author: Dr. Jafor Ikbal
Source: NCTB
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Class: Seven
Author: Dr. Jafor Ikbal
Source: NCTB
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Class: Six
Author: Dr. Jafor Ikbal
Source: NCTB
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Author: Sarat Chandra Chattopadhyay
Source: Department of information technology and electronics west Bangla
