Daniel L. Schwartz (eds.), "The Select Letters of Severus of Antioch" in last modified February 2, 2018, http://syriaca.org/work/10542
   
      
         
            The Select Letters of Severus of Antioch
            ܐܓܪ̈ܬܐ ܗܩ̈ܠܘܓܐ ܕܩܕܝܫܐ ܣܐܘܪܐ
            
               
                  Severus
                  of Antioch
                  
                — 
                  ܣܘܝܪܝܘܣ
                  ܕܐܢܛܝܘܟܝܐ
                
            
            
               This Greek collection of letters by  
               Severus 
               is no longer extant. It contained a selection of at least 700 letters from the larger corpus called 
               The Letters of Severus of Antioch
          .
               This larger collection of at least 3824 letters is also no longer extant.
               We do have extant 123 letters in Syriac translation from one book of 
               The Select Letters, 
               titled The Sixth Book of the Select Letters  of 
                  Severus of Antioch
          , 
               edited and translated by E. W. Brooks.
            
            http://syriaca.org/work/10542
            
            
               The Sixth Book of the Select Letters of Severus Patriarch of Antioch, vol. 2.1
               
            
            
               The Sixth Book of the Select Letters of Severus Patriarch of Antioch, vol. 1.1
               
            
            
               A Collection of Letters of Severus of Antioch from Numberous Manuscripts