"LOGICA." . . "Lógica." . "Logic." . . "Logique." . . "Lógica Formal." . . "Mathematische Logik." . . "Formal Logic : A scientific social Problem" . . . "Formal logic a scientific and social problem" . "Formal logic a scientific and social problem"@en . . . . . "Formal logic, a scientific and social problem" . "Formal logic, a scientific and social problem"@en . . "Formal logic, a scientific and social problem, by F. C. S. Schiller" . . . "Formal logic : a scientific and social proble"@en . . . "Formal Logic a scientific and social problem" . "Formal logic : A scientific and social problem" . . . . . "Formal Logic"@en . . . "Formal Logic. A scientific and social problem"@en . . . . . "Formal Logic : a scientific and social problem"@en . "Formal Logic : a scientific and social problem" . . . . . . . "Formal logic" . . "Formal logic : a scientific and oscial problem" . . . . . . . . . "Formal logic : a scientif. and social problem" . . . "Formal logic. A scientific and social problem" . . "Formal logic : a scientific and social problem"@en . "Formal logic : a scientific and social problem" . . . . . . . . "Formele logica." . .