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		| 1 |  | Data communications for engineers /  Michael Duck, Peter Bishop, Richard Read . - Harlow, England ;  Reading, Mass. :  Addison-Wesley Pub. Co.,  c1996. - xiii, 270 p. :  ill. ;  24 cm. Thông tin xếp giá:  Ấn phẩm chưa sẵn sàng phục vụ bạn đọc
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		| 2 |  | Data communications for engineers /  Michael Duck, Peter Bishop, Richard Read . - Harlow, England ;  Reading, Mass. :  Addison-Wesley Pub. Co.,  1996. - xiii, 270 p. :  ill. ;  24 cm. |  |