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Problem DepartmentV. Thebault, Walter B. Clarke, C. E. Springer, W. E. Byrne, Henry Schroeder, M. S. Robertson, D. L. MacKay, G. W. Wishard, C. W. Trigg, C. N. Mills, E. C. Kennedy, Daniel Arany, Howard D. Grossman, W. V. Parker, H. T. R. Aude and R. E. Gaines · National Mathematics Magazine · 1939