NILSON, ARTHUR R.
Radio operating questions and answers, by Arthur R. Nilson and J. L. Hornung. 2d ed., rev. & enl.
NILSON, ARTHUR R. Radio operating questions and answers, by Arthur R. Nilson and J. L. Hornung. 2d ed., rev. & enl. © on additions & revisions; 11Apr29; A7466. J. L. Hornung (A); 24Aug56; R175812.
J. L. Hornung|A