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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:76762
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en.wikipedia.org/wiki/DeValls_Bluff,_Arkansas (31 May 2010)
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en.wikipedia.org/wiki/De_Valls_Bluff,_Arkansas (29 Jul 2010)
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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:2404204