|  | Logik und Existenz. Eine logistische Analyse der kategorischen Syllogismusfunktoren und das Problem der Nullklasse, p. 108, by Menne, Albert | 1954 | Degenerate Sigma-2 with Unconnectedness 4 | 4 | Rectangle |
|  | Two Logics of Modality, p. 46, by Barber, Richard L. | 1954 | Sherwood-Czeżowski Sigma-3 | 4 | Hexagon |
|  | On Certain Peculiarities of Singular Propositions, p. 393, by Czeżowski, Tadeusz | 1955 | Sherwood-Czeżowski Sigma-3 | 4 | Hexagon |
|  | Perfectibilité de la logique formelle classique, p. 179, by Sesmat, Augustin | 1955 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
|  | Dialectica. First Complete Edition of the Parisian Manuscript, p. 186, by Abaelardus, Petrus; de Rijk, Lambertus Marie (ed.) | 1956 | Classical Sigma-2 | 3 | Rectangle |
|  | Opposition et négation, p. 191, by Blanché, Robert | 1957 | Classical Sigma-2 | 3 | Rectangle |
|  | Opposition et négation, p. 204, by Blanché, Robert | 1957 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
|  | Sur La Structuration du Tableau Des Connectifs Interpropositionnels Binaires, p. 17, by Blanché, Robert | 1957 | Classical Sigma-2 | 3 | Square |
|  | Sur La Structuration du Tableau Des Connectifs Interpropositionnels Binaires, p. 17, by Blanché, Robert | 1957 | Classical Sigma-2 | 3 | Square |
|  | Sur La Structuration du Tableau Des Connectifs Interpropositionnels Binaires, p. 18, by Blanché, Robert | 1957 | Sigma-5 Graph | 4 | Hexagon |
|  | 'This' as a Singular Quantifier, p. 523, by Mackie, J. L. | 1958 | Lenzen Sigma-4 | 5 | Square |
|  | 'This' as a Singular Quantifier, p. 524, by Mackie, J. L. | 1958 | Sherwood-Czeżowski Sigma-3 | 4 | Square |
|  | 'This' as a Singular Quantifier, p. 525, by Mackie, J. L. | 1958 | Sigma-7 Ladder | 8 | Square |
|  | A Précis of Mathematical Logic, p. 14, by Bocheński, Jozef; Bird, Otto (trans.) | 1959 | Classical Sigma-2 | 3 | Rectangle |
|  | Formal Logic, p. 141, by Dopp, Joseph; Ramirez, J. Roland E. (trans.); Sweeney, Robert D. (trans.) | 1960 | Keynes-Johnson Sigma-4 | 7 | Octagon |
|  | Formal Logic, p. 130, by Dopp, Joseph; Ramirez, J. Roland E. (trans.); Sweeney, Robert D. (trans.) | 1960 | Classical Sigma-2 | 3 | Rectangle |
|  | Formal Logic, p. 130, by Dopp, Joseph; Ramirez, J. Roland E. (trans.); Sweeney, Robert D. (trans.) | 1960 | Classical Sigma-2 | 3 | Square |
|  | Formal Logic, p. 130, by Dopp, Joseph; Ramirez, J. Roland E. (trans.); Sweeney, Robert D. (trans.) | 1960 | Classical Sigma-2 | 3 | Square |
|  | Formal Logic, p. 130, by Dopp, Joseph; Ramirez, J. Roland E. (trans.); Sweeney, Robert D. (trans.) | 1960 | Classical Sigma-2 | 3 | Square |
|  | Formal Logic, p. 130, by Dopp, Joseph; Ramirez, J. Roland E. (trans.); Sweeney, Robert D. (trans.) | 1960 | Classical Sigma-2 | 3 | Square |
|  | The Square of Opposition in Action, p. 50, by Doyle, John J. | 1961 | Classical Sigma-2 | 3 | Square |
|  | The Square of Opposition in Action, p. 57, by Doyle, John J. | 1961 | Classical Sigma-2 | 3 | Square |
|  | The Square of Opposition in Action, p. 58, by Doyle, John J. | 1961 | Classical Sigma-2 | 3 | Square |
|  | The Square of Opposition in Action, p. 59, by Doyle, John J. | 1961 | Classical Sigma-2 | 3 | Square |
|  | The Square of Opposition in Action, p. 70, by Doyle, John J. | 1961 | Classical Sigma-2 | 3 | Square |