NILSON, ARTHUR R.
Radio operating questions and answers, by Arthur R. Nilson & J. L. Hornung. 4th ed., rev. & enl.
NILSON, ARTHUR R. Radio operating questions and answers, by Arthur R. Nilson & J. L. Hornung. 4th ed., rev. & enl. © 25Aug32; A54587. Jules L. Hornung (A); 15Apr60; R255626.
Jules L. Hornung|A