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Problem DepartmentV. Thebault, C. W. Trigg, P. D. Thomas, L. E. Bush, Walter B. Clarke, J. W. Peters, L. M. Kelly, Daniel Arany, Johannes Mahrenholz, G. W. Wishard, D. L. MacKay, J. Rosenbaum, Robert C. Yates and E. C. Kennedy · National Mathematics Magazine · 1939