The case for using the term "Australian genocide" rests on evidence from various sources that people argue proves some form of genocide. People cite the list of massacres of indigenous Australians by white settlers, mainly in the 19th century (cf. Blood on the Wattle by Bruce Elder or Frontier History Revisited by Robert Orsted-Jensen); only a few massacres were documented, and the evidence is strong that evidence of massacres was generally covered by secrecy and there are powerful signs that documents had been destroyed. Evidence is solid that Queensland's Native Police produced diaries, collision reports and monthly and quarterly enumerations of 'patrols' and 'collisions' with indigenous people, and that all of this material was stored in the Queensland police department. However, not one single sheet of information of this kind which is today available at the Queensland State archive originate from files delivered by the police department, the material left comes solely from other government offices. Only human interference can produce a total loss of the vast Native Police Force records once stored in the Queensland Police Department.