Sergey Minov and Daniel L. Schwartz (eds.), "Penal laborers" in last modified March 11, 2022, http://syriaca.org/keyword/penal-laborers
  
    
      
        Penal laborers
        
          prisoners
        
        
          prison laborers
        
        
          convict laborers
        
        
          
          
        
        http://syriaca.org/keyword/penal-laborers