. . "WFF 'N PROOF (Game)"@en . _:bnode7authoritiessubjectssh90001516 . _:bnode7authoritiessubjectssh90001516 _:bnode8authoritiessubjectssh90001516 . _:bnode7authoritiessubjectssh90001516 . _:bnode8authoritiessubjectssh90001516 . _:bnode8authoritiessubjectssh90001516 "WFF 'N PROOF (Game)"@en . . . . . . . . _:bnode18authoritiessubjectssh90001516 . _:bnode18authoritiessubjectssh90001516 . _:bnode18authoritiessubjectssh90001516 "Work cat.: Allen, L. WFF 'N PROOF : the game of modern logic, 1972, c1962." . _:bnode18authoritiessubjectssh90001516 "found" . _:bnode24authoritiessubjectssh90001516 . _:bnode24authoritiessubjectssh90001516 . _:bnode24authoritiessubjectssh90001516 "LC data base, 3/28/90;PREMARC;Hennepin;IAC" . _:bnode24authoritiessubjectssh90001516 "notfound" . _:bnode30authoritiessubjectssh90001516 . _:bnode30authoritiessubjectssh90001516 . _:bnode30authoritiessubjectssh90001516 "1990-03-29T00:00:00"^^ . _:bnode30authoritiessubjectssh90001516 "new"^^ . _:bnode30authoritiessubjectssh90001516 .