LEADER 00000nam 2200193 a 4500 001 0383763 003 UkHlHU 007 t 008 001908 1 1951 000 eng 040 UkHlHU 050 4 BC 199 M6 W9 100 1 Wright, G. H. von|q(Georg Henrik),|d1916-2003. 245 03 An essay in modal logic. 260 Amsterdam :|bNorth-HollandPublishing Co.,|c1951. 300 90p. 946 6XX absent
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