,studies and ,exercises in ,formal      
,logic          ,john ,neville ,keynes  
,london    ,,macmillan ,,and ,,co41     
,,limited    ,,new ,,york3 ,,the        
,,macmillan ,,company    #aijf          
,because of nature of the source        
material1 it was decided  that a text   
version was impractical4