COOPERATIVE TEST SERVICE.
Cooperative teaching unit tests on fifty major topics in aeronautics. With the aid of aeronautics teachers & ground school instructors.
COOPERATIVE TEST SERVICE. Cooperative teaching unit tests on fifty major topics in aeronautics. With the aid of aeronautics teachers & ground school instructors. © 14Jan44; AA458322. Educational Testing Service (PWH); 30Jun71; R508436.
Educational Testing Service|PWH