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Problem DepartmentR. B. Thompson, Johannes Mahrenholz, W. V. Parker, Fred Marer, Fred Fender, C. W. Trigg, Yudell Luke, Walter B. Clarke, Henry Dantzig, J. Rosenbaum, M. S. Robertson, Albert Farnell, E. P. Starke, Robert C. Yates, M. Kac, L. E. Bush, V. Thebault and J. W. Peters · National Mathematics Magazine · 1939