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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:1948941
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www.sharylscabin.com/Allamakee/cemetery/cemnotes.htm#Ion (27 Apr 2013)
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iowagravestones.org/cemetery_list.php?CID=3&cName=Ion (1 May 2013)
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www.sharylscabin.com/Allamakee/cemetery/Ion.htm (23 Oct 2012)