Examination in radio-high school level. Book 3: Tubes and circuits. Form SRd-3-A-4. By members of the Examinations Staff for the U.S. Armed Forces Institute, Ralph W. Tyler, director.
UNITED STATES ARMED FORCES INSTITUTE, MADISON, WIS. Examination in radio-high school level. Book 3: Tubes and circuits. Form SRd-3-A-4. By members of the Examinations Staff for the U.S. Armed Forces Institute, Ralph W. Tyler, director. © 21Apr44; AA466291. Educational Testing Service (PWH); 30Jun71; R508456.
Educational Testing Service|PWH