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TEXT BOOK OF SOUND

By KHANNA,D.R. DELHI Atma Ram and Sons 1965 . 22X14

By KHANNA,D.R. DELHI Atma Ram and Sons 1965 . 22X14

By KHANNA,D.R. DELHI Atma Ram and Sons 1965 . 22X14

By Khanna, D R | Gulati, H R. New Delhi R Chand & Co 1979 . p.595

By KHANNA,D.R. | BEDI,R.S.. DELHI ATMA RAM AND SONS 1983 . p.508

By KHANNA D.R. | GULATI, H.R.. NEWDELHI McGraw-Hill 1984 . p.665