The sources preserved in ARSI are different from ours in periodization and type. However those documents that needed to be sent in duplicate to the General Curia and the Provincial Curia are available in the historical archives of both institutions. I.e. if a historia domus is missing from our Archives, you can check if the other copy is available at ARSI. In addition, sometimes Province fonds preserve the minutes of letters addressed to Father General, but the originals can be found in ARSI.