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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:827658
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www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=1991509
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www.findagrave.com/cgi-bin/fg.cgi?page=cr&CRid=1991510
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en.wikipedia.org/wiki/Brock,_Nebraska (10 Aug 2010)
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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:2397463