Libros de radio operators

Broadcast and two-way radio operators permit handbook

The ARRL Operating Manual

Secondary School Admissions Test/ High School Entrance Exams (SSAT) (Ssat)

The ARRL extra class license manual for ham radio

General radiotelephone license handbook

DX brings danger

Now you're talking!

Staying alive

Third class FCC license study guide

Tests-answers for FCC general radiotelephone operator license