Some comments on Latin squares and on Graeco-Latin squares, illustrated with postage stamps and old playing cards

Bachet’s square, Bibliography, Bi-square, Raj Chandra Bose, József Dénes, Diagonal Latin squares of order 6, Leonhard Euler, Euler squares, Eulerian squares, Euler’s conjecture, Sir Ronald Aylmer Fisher, Graeco-Roman squares, History, Simon de La Loubère, Knut Vik design, Knight’s move design, Knight’s tour, Magic squares, MOLS, Mutually orthogonal Latin squares, Jacques Ozanam, Ozanam–Grandin solution to the Magic Card Puzzle, Edward Tilden Parker, Parker’s Graeco-Latin square of order 10, Georges Perec, Abbé François-Guillaume Poignard, Sharadchandra Shankar Shrikhande, Thirty-six officers problem, Topical philately, Weißwurst Äquator, 01A45, 01A50, 05A99, 05B15, 62K05, 62K10, 62K15,