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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:1939436
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www.interment.net/data/us/il/mchenry/haeger/david.htm (22 Oct 2009)
Cemetery records of Haeger Cemetery in McHenry County, Illinois
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www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=925916
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www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=925924