"Radio transmisores y transmisiĆ³n." . . . . . "Understanding radio; a quide to practical operation and theory" . . . . . "Understanding radio a guide to practical operation and theory"@en . . . . . . . . . "Understanding radio; a guide to practical operation and theory"@en . "Understanding radio; a guide to practical operation and theory" . "Understanding Radio. A guide to practical operation and theory. By H.M. Watson ... Herbert E. Welch ... and George S. Eby"@en . . . . "Radio"@en . "Understanding radio : a guide to practical operation and theory" . "Understanding radio : a guide to practical operation and theory"@en . "Radio" . . . . "Understanding Radio : a guide to practical operation and theory" . . . . . "Radio." . . "Circuitos radio." . . "Radio receptores." . . . .