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Spencer S. Swinton
Educational Testing Service c1983 TOEFL research reports report 14
Available at 3 libraries
Spencer S. Swinton, Donald E. Powers
Educational Testing Service c1980 TOEFL research reports report 6
John L.D. Clark, Spencer S. Swinton
Educational Testing Service c1980 TOEFL research reports report 7
Available at 2 libraries
Paul J. Angelis, Spencer S. Swinton, William R. Cowell
Educational Testing Service c1979 TOEFL research reports report 3
Educational Testing Service c1979 TOEFL research reports report 4