I believe all 6 volumes of the Jackson County Cemetery Books are at the Register of Deeds Office at the courthouse, although I do know for sure they have them at the Historical Society next door. The Ellefson's in Little Norway are in Volume V. The Mortenson's appear to be in Volume VI, which includes Springfield Township. Trempealeau Valley and Woodlawn Cemeteries both have Mortenson's. These were recorded in 1991, so any later burials would not be listed in these books.