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1. Introduction to manual telephony

by Das, P.N.

Edition: 1st ed.Publisher: Calcutta Modern Book Agency 1973Availability: Items available for loan: Central Library, BUET [623.85/DAS/1973] (1).

2. Introduction to automatic telephony for the undergraduate students of tele-communication and electrical engineering

by Das, P.N.

Edition: 4th ed.Publisher: Calcutta Modern book 1975Availability: Items available for loan: Central Library, BUET [623.85/DAS/1975] (1).