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William E. Byrne, Paul D. Thomas, Walter B. Clarke, D. L. MacKay, L. Shenfil, W. V. Parker, Karleton W. Crain, R. F. Rinehart, Robert L. Broussard, Alice M. H'Doubler, A. B. Farnell, Orval D. Hughes, Robert C. Yates, E. P. Starke, J. C. Currie, Problem Department, National Mathematics Magazine, Vol. 16, No. 7 (Apr., 1942), pp. 352-357
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