Users use almost enirely German sourcesThat can be very easily seen whilst one tries to edit articles  rd reasonI call it thrifty managing of trutWhat it basically means is that Wikipedians of the above mentioned sort  accept material that disproves the Polishness of western and northern Poland and delete material that proves itDeleted without giving any reasons because if they ever gave any they would reveal themselves and their true unwritten agendaI am a victim of such behaviour  th reason