NILSON, ARTHUR R.
Radio operating questions and answers, by Arthur R. Nilson & J. L. Hornung. 6th ed.
NILSON, ARTHUR R. Radio operating questions and answers, by Arthur R. Nilson & J. L. Hornung. 6th ed. © 8May36; A94394. J. L. Hornung (A); 23Oct63; R324152.
J. L. Hornung|A