00280nam a2200109   4500245003400000100001500034250001200049260004400061300001600105490003200121082001700153  aManual of logiccby J. Welton  aWelton, J.  a2nd ed.  aLondonbUniversity Tutorial Pressc1901  a2v.;  17cm.  aUniversity Tutorial series   a160.202bWEL