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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:407086
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en.wikipedia.org/wiki/Deerfield,_Illinois (19 Jul 2010)
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geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:2398705
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idaillinois.org/cdm/landingpage/collection/deerfiel001 (23 Feb 2013)