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200 1 $a<<An >>essay in modal logic$fGeorge h. Von Wright.
210   $aAmsterdam$cNorth-Holland publishing company$d1951
215   $aVI, 90 p.$d22 cm
225 1 $aStudies in logic and the foundations of mathematics
610 0 $aLogica matematica
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700  1$aVon Wright,$bGeorge H.$0331531
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