00414nam a2200157 a 450000500170000000800410001702000150005804100080007308200080008110000190008924500420010825000130015026400510016330000280021465000140024220260717100929.0260717s1987    ii            000 0 eng d  a8121902711  aeng04a5341 aSaihgal, R. L.12aA text book of sound /cSaihgal, R.L.  aRev. ed. 1aNew Delhi :bS.Chand & Company Pvt Ltd,c1987.  aill. 283p. : ill ; ill. 4aSound and