Principles of radio /
Henney Keith
Principles of radio / by Henney Keith and Glen A. Richardson - 6th ed. - New York : John Wiley & Sons, 1955.
Broad Casting Telecommunication
Principles of radio / by Henney Keith and Glen A. Richardson - 6th ed. - New York : John Wiley & Sons, 1955.
Broad Casting Telecommunication