original: atlantic hurricane seasons pre-1600 1600s / 10s 1620s / 30s observation data for years before 1492 is completely unavailable because record keeping was virtually non-existent in the pre-columbian era , and any records that may have once existed have long since been lost .
simplifications: atlantic hurricane seasons of pre 1600 , 1600s , 1610s , 1620s and 1630s . observation data for years before 1492 is completely not accessible because record keeping was practically absent in the pre-columbian era . any such records that may have once present have long since been lost . atlantic hurricane seasons pre-1600 1600s / 10s 1620s / 30s observation knowledge for computers for years before 1492 is completely unavailable because record keeping was almost non-existent in the pre-columbian time , and any records that may have once had existence have long since been lost . there are no records left of the atlantic hurricane seasons in the pre-columbian era . atlantic hurricane seasons pre-1600 1600s / 10s 1620s / 30s observation data for years before 1492 is completely unavailable because record keeping was almost non-existent in the pre-columbian time in history , and any records that may have once existed have long since been lost . atlantic hurricane seasons pre-1600 1600s / 10s 1620s / 30s observation data for years before 1492 is completely unavailable because record keeping was virtually non-existent in the pre-columbian era , and any records that may have once existed have long since been lost . atlantic hurricane season observations before the 1600 's simply do not exist , and any records that did exist have long since been lost . observation data for atlantic hurricane seasons before 1942 does not exist because record keeping did not exist in the pre-columbian era , and any records that may have existed have been lost for a long time . atlantic hurricane seasons pre-1600 1600s / 10s 1620s / 30s observation data years before 1492 is all unavailable because record keeping did not exist in the pre-columbian era , and any records that may have existed have been lost .