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These data were appended to the original dataset and additional fields were added to differentiate the photo years and identify those persistent prairie dog towns from the 1997 survey to the 2004 survey. Subsequently, an aerial photo survey using 2005 data was interpreted and field truthed and appended to this dataset (Johnson et al. 2010). The area of the 2005 survey is also a subset of the originhal 1996-97 survey. 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