Library of Congress. Copyright Office, U.S. Copyright Renewals, 1972 July - December
“ End-of-course test in Latin fundamentals. Course no.EM560. By members of the examinations staff, Ralph W. Tyler, director. © 5Jan45; AA6944. Educational Testing Service (PWH) ; 22Aug72; R534774. End-of-course test in Life insurance. Course no.EM758. By examinations staff, Ralph W. Tyler, director. © 27Mar45; AA19544. Educational Testing Service (PWH) ; 13Oct72; R537034. End-of-course test in Mathematics for technical and vocational schools. ”
