NILSON, ARTHUR R.
Radio operating questions and answers, by Arthur R. Nilson & J. L. Hornung. 7th ed.
NILSON, ARTHUR R. Radio operating questions and answers, by Arthur R. Nilson & J. L. Hornung. 7th ed. © 6Sep40; A145064. J. L. Hornung (A); 22Apr68; R433749.
J. L. Hornung|A