electronics rules and regulations morse code ( a study manual for A.S.O.L. examinations grade-I, grade-II and restricted Ponnusamy, A. creator xxu Salem Bright Publishers 2005 5th ed. eng 164 p. 21 cm ( pbk.) by A. Ponnusamy 621.38416 ENG-87695 DBAD / PUB 080908 20080908170217.0